Reply to Objection 6: The first agent is a voluntary agent. And although He had the eternal will to produce some effect, yet He did not produce an eternal effect. Nor is it necessary for some change to be presupposed, not even on account of imaginary time. For we must take into consideration the difference between a particular agent, that presupposes something and produces something else, and the universal agent, who produces the whole. The particular agent produces the form, and presupposes the matter; and hence it is necessary that it introduce the form in due proportion into a suitable matter. Hence it is correct to say that it introduces the form into such matter, and not into another, on account of the different kinds of matter. But it is not correct to say so of God Who produces form and matter together: whereas it is correct to say of Him that He produces matter fitting to the form and to the end. Now, a particular agent presupposes time just as it presupposes matter. Hence it is correctly described as acting in time "after" and not in time "before," according to an imaginary succession of time after time. But the universal agent who produces the thing and time also, is not correctly described as acting now, and not before, according to an imaginary succession of time succeeding time, as if time were presupposed to His action; but He must be considered as giving time to His effect as much as and when He willed, and according to what was fitting to demonstrate His power. For the world leads more evidently to the knowledge of the divine creating power, if it was not always, than if it had always been; since everything which was not always manifestly has a cause; whereas this is not so manifest of what always was.
Reply to Objection 7: As is stated (Phys. iv, text 99), "before" and "after" belong to time, according as they are in movement. Hence beginning and end in time must be taken in the same way as in movement. Now, granted the eternity of movement, it is necessary that any given moment in movement be a beginning and an end of movement; which need not be if movement be a beginning. The same applies to the "now" of time. Thus it appears that the idea of the instant "now," as being always the beginning and end of time, presupposes the eternity of time and movement. Hence Aristotle brings forward this reason (Phys. viii, text 10) against those who asserted the eternity of time, but denied the eternity of movement.
Reply to Objection 8: God is prior to the world by priority of duration. But the word "prior" signifies priority not of time, but of eternity. Or we may say that it signifies the eternity of imaginary time, and not of time really existing; thus, when we say that above heaven there is nothing, the word "above" signifies only an imaginary place, according as it is possible to imagine other dimensions beyond those of the heavenly body.
Reply to Objection 9: As the effect follows from the cause that acts by nature, according to the mode of its form, so likewise it follows from the voluntary agent, according to the form preconceived and determined by the agent, as appears from what was said above (Q[19], A[4]; Q[41], A[2]). Therefore, although God was from eternity the sufficient cause of the world, we should not say that the world was produced by Him, except as preordained by His will---that is, that it should have being after not being, in order more manifestly to declare its author.
Reply to Objection 10: Given the action, the effect follows according to the requirement of the form, which is the principle of action. But in agents acting by will, what is conceived and preordained is to be taken as the form, which is the principle of action. Therefore from the eternal action of God an eternal effect did not follow; but such an effect as God willed, an effect, to wit, which has being after not being.
Whether it is an article of faith that the world began?
Objection 1: It would seem that it is not an article of faith but a demonstrable conclusion that the world began. For everything that is made has a beginning of its duration. But it can be proved demonstratively that God is the effective cause of the world; indeed this is asserted by the more approved philosophers. Therefore it can be demonstratively proved that the world began.
Objection 2: Further, if it is necessary to say that the world was made by God, it must therefore have been made from nothing or from something. But it was not made from something; otherwise the matter of the world would have preceded the world; against which are the arguments of Aristotle (De Coelo i), who held that heaven was ungenerated. Therefore it must be said that the world was made from nothing; and thus it has being after not being. Therefore it must have begun.
Objection 3: Further, everything which works by intellect works from some principle, as appears in all kinds of craftsmen. But God acts by intellect: therefore His work has a principle. The world, therefore, which is His effect, did not always exist.
Objection 4: Further, it appears manifestly that certain arts have developed, and certain countries have begun to be inhabited at some fixed time. But this would not be the case if the world had been always. Therefore it is manifest that the world did not always exist.
Objection 5: Further, it is certain that nothing can be equal to God. But if the world had always been, it would be equal to God in duration. Therefore it is certain that the world did not always exist.
Objection 6: Further, if the world always was, the consequence is that infinite days preceded this present day. But it is impossible to pass through an infinite medium. Therefore we should never have arrived at this present day; which is manifestly false.
Objection 7: Further, if the world was eternal, generation also was eternal. Therefore one man was begotten of another in an infinite series. But the father is the efficient cause of the son (Phys. ii, text 5). Therefore in efficient causes there could be an infinite series, which is disproved (Metaph. ii, text 5).
Objection 8: Further, if the world and generation always were, there have been an infinite number of men. But man's soul is immortal: therefore an infinite number of human souls would actually now exist, which is impossible. Therefore it can be known with certainty that the world began, and not only is it known by faith.
On the contrary, The articles of faith cannot be proved demonstratively, because faith is of things "that appear not" ( Heb. 11:1 ). But that God is the Creator of the world: hence that the world began, is an article of faith; for we say, "I believe in one God," etc. And again, Gregory says (Hom. i in Ezech.), that Moses prophesied of the past, saying, "In the beginning God created heaven and earth": in which words the newness of the world is stated. Therefore the newness of the world is known only by revelation; and therefore it cannot be proved demonstratively.
I answer that, By faith alone do we hold, and by no demonstration can it be proved, that the world did not always exist, as was said above of the mystery of the Trinity (Q[32], A[1]). The reason of this is that the newness of the world cannot be demonstrated on the part of the world itself. For the principle of demonstration is the essence of a thing. Now everything according to its species is abstracted from "here" and "now"; whence it is said that universals are everywhere and always. Hence it cannot be demonstrated that man, or heaven, or a stone were not always. Likewise neither can it be demonstrated on the part of the efficient cause, which acts by will. For the will of God cannot be investigated by reason, except as regards those things which God must will of necessity; and what He wills about creatures is not among these, as was said above (Q[19], A[3]). But the divine will can be manifested by revelation, on which faith rests. Hence that the world began to exist is an object of faith, but not of demonstration or science. And it is useful to consider this, lest anyone, presuming to demonstrate what is of faith, should bring forward reasons that are not cogent, so as to give occasion to unbelievers to laugh, thinking that on such grounds we believe things that are of faith.
Reply to Objection 1: As Augustine says (De Civ. Dei xi, 4), the opinion of philosophers who asserted the eternity of the world was twofold. For some said that the substance of the world was not from God, which is an intolerable error; and therefore it is refuted by proofs that are cogent. Some, however, said that the world was eternal, although made by God. For they hold that the world has a beginning, not of time, but of creation, so that in a certain hardly intelligible way it was always made. "And they try to explain their meaning thus (De Civ. Dei x, 31): for as, if the foot were always in the dust from eternity, there would always be a footprint which without doubt was caused by him who trod on it, so also the world always was, because its Maker always existed." To understand this we must consider that the efficient cause, which acts by motion, of necessity precedes its effect in time; because the effect is only in the end of the action, and every agent must be the principle of action. But if the action is instantaneous and not successive, it is not necessary for the maker to be prior to the thing made in duration as appears in the case of illumination. Hence they say that it does not follow necessarily if God is the active cause of the world, that He should be prior to the world in duration; because creation, by which He produced the world, is not a successive change, as was said above (Q[45], A[2]).
Reply to Objection 2: Those who would say that the world was eternal, would say that the world was made by God from nothing, not that it was made after nothing, according to what we understand by the word creation, but that it was not made from anything; and so also some of them do not reject the word creation, as appears from Avicenna (Metaph. ix, text 4).
Reply to Objection 3: This is the argument of Anaxagoras (as quoted in Phys. viii, text 15). But it does not lead to a necessary conclusion, except as to that intellect which deliberates in order to find out what should be done, which is like movement. Such is the human intellect, but not the divine intellect (Q[14], AA[7],12).
Reply to Objection 4: Those who hold the eternity of the world hold that some region was changed an infinite number of times, from being uninhabitable to being inhabitable and "vice versa," and likewise they hold that the arts, by reason of various corruptions and accidents, were subject to an infinite variety of advance and decay. Hence Aristotle says (Meteor. i), that it is absurd from such particular changes to hold the opinion of the newness of the whole world.
Reply to Objection 5: Even supposing that the world always was, it would not be equal to God in eternity, as Boethius says (De Consol. v, 6); because the divine Being is all being simultaneously without succession; but with the world it is otherwise.
Reply to Objection 6: Passage is always understood as being from term to term. Whatever bygone day we choose, from it to the present day there is a finite number of days which can be passed through. The objection is founded on the idea that, given two extremes, there is an infinite number of mean terms.
Reply to Objection 7: In efficient causes it is impossible to proceed to infinity "per se"---thus, there cannot be an infinite number of causes that are "per se" required for a certain effect; for instance, that a stone be moved by a stick, the stick by the hand, and so on to infinity. But it is not impossible to proceed to infinity "accidentally" as regards efficient causes; for instance, if all the causes thus infinitely multiplied should have the order of only one cause, their multiplication being accidental, as an artificer acts by means of many hammers accidentally, because one after the other may be broken. It is accidental, therefore, that one particular hammer acts after the action of another; and likewise it is accidental to this particular man as generator to be generated by another man; for he generates as a man, and not as the son of another man. For all men generating hold one grade in efficient causes---viz. the grade of a particular generator. Hence it is not impossible for a man to be generated by man to infinity; but such a thing would be impossible if the generation of this man depended upon this man, and on an elementary body, and on the sun, and so on to infinity.
Reply to Objection 8: Those who hold the eternity of the world evade this reason in many ways. For some do not think it impossible for there to be an actual infinity of souls, as appears from the Metaphysics of Algazel, who says that such a thing is an accidental infinity. But this was disproved above (Q[7], A[4]). Some say that the soul is corrupted with the body. And some say that of all souls only one will remain. But others, as Augustine says [*Serm. xiv, De Temp. 4,5; De Haeres., haeres. 46; De Civ. Dei xii. 13], asserted on this account a circuit of souls---viz. that souls separated from their bodies return again thither after a course of time; a fuller consideration of which matters will be given later (Q[75], A[2]; Q[118], A[6]). But be it noted that this argument considers only a particular case. Hence one might say that the world was eternal, or least some creature, as an angel, but not man. But we are considering the question in general, as to whether any creature can exist from eternity.
Whether the creation of things was in the beginning of time?