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Guide for the Perplexed, by Moses Maimonides, Friedländer tr. [1904], at sacred-texts.com
ACCORDING to Proposition XXV., a moving agent must exist which has moved the substance of all existing transient things and enabled it to receive Form. The cause of the motion of that agent is found in the existence of another motor of the same or of a different class, the term "motion," in a general sense, being common to four categories (Prop. IV.). This series of motions is not infinite (Prop. III.); we find that it can only be continued till the motion of the fifth element is arrived at, and then it ends. The motion of the fifth element is the source of every force that moves and prepares any substance on earth for its combination with a certain form, and is connected with that force by a chain of intermediate motions. The celestial sphere [or the fifth element) performs the act of locomotion which is the first of the several kinds of motion (Prop. XIV.), and all locomotion is found to be the indirect effect of the motion of this sphere; e.g., a stone is set in motion by a stick, the stick by a man's hand, the hand by the sinews, the sinews by the muscles, the muscles by the nerves, the nerves by the natural heat of the body, and the heat of the body by its form. This is undoubtedly the immediate motive cause, but the action of this immediate cause is due to a certain design, e.g., to bring a stone into a hole by striking against it with a stick in order to prevent the draught from coming through the crevice. The motion of the air that causes the draught is the effect of the motion of
the celestial sphere. Similarly it may be shown that the ultimate cause of all genesis and destruction can be traced to the motion of the sphere. But the motion of the sphere must likewise have been effected by an agent (Prop. XVII.) residing either without the sphere or within it; a third case being impossible. In the first case, if the motor is without the sphere, it must either be corporeal or incorporeal: if incorporeal, it cannot be said that the agent is without the sphere; it can only be described as separate from it; because an incorporeal object can only be said metaphorically to reside without a certain corporeal object. In the second case, if the agent resides within the sphere, it must be either a force distributed throughout the whole sphere so that each part of the sphere includes a part of the force, as is the case with the heat of fire; or it is an indivisible force, e.g., the soul and the intellect (Props. X. and XI.). The agent which sets the sphere in motion must consequently be one of the following four things: a corporeal object without the sphere; an incorporeal object separate from it; a force spread throughout the whole of the sphere; or an indivisible force [within the sphere].
The first case, viz., that the moving agent of the sphere is a corporeal object without the sphere, is impossible, as will be explained. Since the moving agent is corporeal, it must itself move while setting another object in motion (Prop. IX.), and as the sixth element would likewise move when imparting motion to another body, it would be set in motion by a seventh element, which must also move. An infinite number of bodies would thus be required before the sphere could be set in motion. This is contrary to Proposition II.
The third case, viz., that the moving object be a force distributed throughout the whole body, is likewise impossible. For the sphere is corporeal, and must therefore be finite (Prop. I.); also the force it contains must be finite (Prop. XII.), since each part of the sphere contains part of the force (Prop. XI.): the latter can consequently not produce an infinite motion, such as we assumed according to Proposition XXVI., which we admitted for the present.
The fourth case is likewise impossible, viz., that the sphere is set in motion by an indivisible force residing in the sphere in the same manner as the soul resides in the body of man. For this force, though indivisible, could not be the cause of infinite motion by itself alone: because if that were the case the prime motor would have an accidental motion (Prop. VI.). But things that move accidentally must come to rest (Prop. VIII.), and then the thing comes also to rest which is set in motion. (The following may serve as a further illustration of the nature of accidental motion. When man is moved by the soul, i.e., by his form, to go from the basement of the house to the upper storey, his body moves directly, while the soul, the really efficient cause of that motion, participates in it accidentally. For through the translation of the body from the basement to the upper storey, the soul has likewise changed its place, and when no fresh impulse for the motion of the body is given by the soul, the body which has been set in motion by such impulse comes to rest, and the accidental motion of the soul is discontinued). Consequently the motion of that supposed first motor must be due to some cause which does not form part of things composed of two elements, viz., a moving agent
and an object moved: if such a cause is present the motor in that compound sets the other element in motion; in the absence of such a cause no motion takes place. Living beings do therefore not move continually, although each of them possesses an indivisible motive element; because this element is not constantly in motion, as it would be if it produced motion of its own accord. On the contrary, the things to which the action is due are separate from the motor. The action is caused either by desire for that which is agreeable, or by aversion from that which is disagreeable, or by some image, or by some ideal when the moving being has the capacity of conceiving it. When any of these causes are present then the motor acts; its motion is accidental, and must therefore come to an end (Prop. VIII.). If the motor of the sphere were of this kind the sphere could not move ad infinitum. Our opponent, however, holds that the spheres move continually ad infinitum: if this were the case, and it is in fact possible (Prop. XIII.), the efficient cause of the motion of the sphere must, according to the above division, be of the second kind, viz., something incorporeal and separate from the sphere.
It may thus be considered as proved that the efficient cause of the motion of the sphere, if that motion be eternal, is neither itself corporeal nor does it reside in a corporeal object; it must move neither of its own accord nor accidentally; it must be indivisible and unchangeable (Prop. VII. and Prop. V.). This Prime Motor of the sphere is God, praised be His name!
The hypothesis that there exist two Gods is inadmissible, because absolutely incorporeal beings cannot be counted (Prop. XVI.), except as cause and effect; the relation of time is not applicable to God (Prop. XV.), because motion cannot be predicated of Him.
The result of the above argument is consequently this: the sphere cannot move ad infinitum of its own accord; the Prime Motor is not corporeal, nor a force residing within a body; it is One, unchangeable, and in its existence independent of time. Three of our postulates are thus proved by the principal philosophers.
The philosophers employ besides another argument, based on the following proposition of Aristotle. If there be a thing composed of two elements, and the one of them is known to exist also by itself, apart from that thing, then the other element is likewise found in existence by itself separate from that compound. For if the nature of the two elements were such that they could only exist together--as, e.g., matter and form--then neither of them could in any way exist separate from the other. The fact that the one component is found also in a separate existence proves that the two elements are not indissolubly connected, and that the same must therefore be the case with the other component. Thus we infer from the existence of honey-vinegar and of honey by itself, that there exists also vinegar by itself. After having explained this proposition Aristotle continues thus: We notice many objects consisting of a motor and a motum, i.e., objects which set other things in motion, and whilst doing so are themselves set in motion by other things; such is clearly the case as regards all the middle members of a series of things in motion. We also see a thing that is moved, but does not itself move anything, viz., the last member of the series: consequently a motor must exist without being at the same time a motum, and that is the Prime Motor, which,
not being subject to motion, is indivisible, incorporeal, and independent of time, as has been shown in the preceding argument.
Third Philosophical Argument.--This is taken from the words of Aristotle, though he gives it in a different form. It runs as follows: There is no doubt that many things actually exist, as, e.g., things perceived with the senses. Now there are only three cases conceivable, viz., either all these things are without beginning and without end, or all of them have beginning and end, or some are with and some without beginning and end. The first of these three cases is altogether inadmissible, since we clearly perceive objects which come into existence and are subsequently destroyed. The second case is likewise inadmissible, for if everything had but a temporary existence all things might be destroyed, and that which is enunciated of a whole class of things as possible is necessarily actual. All things must therefore come to an end, and then nothing would ever be in existence, for there would not exist any being to produce anything. Consequently nothing whatever would exist [if all things were transient]; but as we see things existing, and find ourselves in existence we conclude as follows:--Since there are undoubtedly beings of a temporary existence, there must also be an eternal being that is not subject to destruction, and whose existence is real, not merely possible.
It has been further argued that the existence of this being is necessary, either on account of itself alone or on account of some external force. In the latter case its existence and non-existence would be equally possible, because of its own properties, but its existence would be necessary on account of the external force. That force would then be the being that possesses absolute existence (Prop. XIX). It is therefore certain that there must be a being which has absolutely independent existence, and is the source of the existence of all things, whether transient or permanent, if, as Aristotle assumes. there is in existence such a thing, which is the effect of an eternal cause, and must therefore itself be eternal. This is a proof the correctness of which is not doubted, disputed, or rejected, except by those who have no knowledge of the method of proof. We further say that the existence of anything that has independent existence is not due to any cause (Prop. X.), and that such a being does not include any plurality whatever (Prop. XXI.); consequently it cannot be a body, nor a force residing in a body (Prop. XXII.). It is now clear that there must be a being with absolutely independent existence, a being whose existence cannot be attributed to any external cause, and which does not include different elements; it cannot therefore be corporeal, or a force residing in 4 corporeal object; this being is God.
It can easily be proved that absolutely independent existence cannot be attributed to two beings. For, if that were the case, absolutely independent existence would be a property added to the substance of both; neither of them would be absolutely independent on account of their essence, but only through a certain property, viz., that of this independent existence, which is common to both. It can besides be shown in many ways that independent existence cannot be reconciled with the principle of dualism by any means. It would make no difference, whether we imagine two beings of similar or of different properties. The reason for all this is to be sought in the absolute simplicity and in the utmost perfection of the essence of this being, which is
the only member of its species, and does not depend on any cause whatever this being has therefore nothing in common with other beings.
Fourth Argument.--This is likewise a well-known philosophical argument. We constantly see things passing from a state of potentiality to that of actuality, but in every such case there is for that transition of a thing an agent separate from it (Prop. XVIII). It is likewise clear that the agent has also passed from potentiality to actuality. It has at first been potential, because it could not be actual, owing to some obstacle contained in itself, or on account of the absence of a certain relation between itself and the object of its action: it became an actual agent as soon as that relation was present. Whichever cause be assumed, an agent is again necessary to remove the obstacle or to create the relation. The same can be argued respecting this last-mentioned agent that creates the relation or removes the obstacle. This series of causes cannot go on ad infinitum; we must at last arrive at a cause of the transition of an object from the state of potentiality to that of actuality, which is constant, and admits of no potentiality whatever. In the essence of this cause nothing exists potentially, for if its essence included any possibility of existence it would not exist at all (Prop. XXIII.); it cannot be corporeal, but it must be spiritual (Prop. XXIV.); and the immaterial being that includes no possibility whatever, but exists actually by its own essence, is God. Since He is incorporeal, as has been demonstrated, it follows that He is One (Prop. XVI).
Even if we were to admit the Eternity of the Universe, we could by any of these methods prove the existence of God; that He is One and incorporeal, and that He does not reside as a force in a corporeal object.
The following is likewise a correct method to prove the Incorporeality and the Unity of God: If there were two Gods, they would necessarily have one element in common by virtue of which they were Gods, and another element by which they were distinguished from each other and existed as two Gods; the distinguishing element would either be in both different from the property common to both-in that case both of them would consist of different elements, and neither of them would be the First Cause, or have absolutely independent existence; but their existence would depend on certain causes (Prop. XIX.)--or the distinguishing element would only in one of them be different from the element common to both: then that being could not have absolute independence.
Another proof of the Unity of God.--It has been demonstrated by proof that the whole existing world is one organic body, all parts of which are connected together; also, that the influences of the spheres above pervade the earthly substance and prepare it for its forms. Hence it is impossible to assume that one deity be engaged in forming one part, and another deity in forming another part of that organic body of which all parts are closely connected together. A duality could only be imagined in this way, either that at one time the one deity is active, the other at another time, or that both act simultaneously, nothing being done except by both together. The first alternative is certainly absurd for many reasons: if at the time the one deity be active the other could also be active, there is no reason why the one deity should then act and the other not; if, on the other hand, it be impossible for the one deity to act when the other is at work, there must be
some other cause [besides these deities] which [at a certain time] enables the one to act and disables the other. [Such difference would not be caused by time], since time is without change, and the object of the action likewise remains one and the same organic whole. Besides, if two deities existed in this way, both would be subject to the relations of time, since their actions would depend on time; they would also in the moment of acting pass from potentiality to actuality, and require an agent for such transition: their essence would besides include possibility [of existence]. It is equally absurd to assume that both together produce everything in existence, and that neither of them does anything alone; for when a number of forces must be united for a certain result, none of these forces acts of its own accord, and none is by itself the immediate cause of that result, but their union is the immediate cause. It has, furthermore, been proved that the action of the absolute cannot be due to an [external] cause. The union is also an act which presupposes a cause effecting that union, and if that cause be one, it is undoubtedly God: but if it also consists of a number of separate forces, a cause is required for the combination of these forces, as in the first case. Finally, one simple being must be arrived at, that is the cause of the existence of the Universe, which is one whole; it would make no difference whether we assumed that the First Cause had produced the Universe by creatio ex nihilo, or whether the Universe co-existed with the First Cause. It is thus clear how we can prove the Unity of God from the fact that this Universe is one whole.
Another argument concerning the Incorporeality of God.--Every corporeal object is composed of matter and form (Prop. XXII.); every compound of these two elements requires an agent for effecting their combination. Besides, it is evident that a body is divisible and has dimensions: a body is thus undoubtedly subject to accidents. Consequently nothing corporeal can be a unity, either because everything corporeal is divisible or because it is a compound; that is to say, it can logically be analysed into two elements; because a body can only be said to be a certain body when the distinguishing element is added to the corporeal substratum, and must therefore include two elements: but it has been proved that the Absolute admits of no dualism whatever.
Now that we have discussed these proofs, we will expound our own method in accordance with our promise.