of that possibility? for there must be in existence something of which that possibility can be predicated. This is a forcible argument in favour of the Eternity of the Universe. Some of the later schools of the Mutakallemim imagined that they could confute this argument by objecting that the possibility rests with the agent, and not with the production. But this objection is of no force whatever: for there are two distinct possibilities, viz., the thing produced has had the possibility of being produced before this actually took place: and the agent has had the possibility of producing it before he actually did so. There are, therefore, undoubtedly two possibilities -- that of the substance to receive a certain form, and that of the agent to perform a certain act.
These are the principal methods, based on the properties of the Universe, by which Aristotle proves the Eternity of the Universe. There are, however, other methods of proving the Eternity of the Universe. They are based on the notions formed of God, and philosophers after Aristotle derived them from his philosophy. Some of them employed the following argument:
Fifth Method. -- If God produced the Universe from nothing, He must have been a potential agent before He was an actual one, and must have passed from a state of potentiality into that of actuality -- a process that is merely possible, and requires an agent for effecting it. This argument is likewise a source of great doubts, and every intelligent person must examine it in order to refute it and to expose its character.
Sixth Method. -- An agent is active at one time and inactive at another, according as favourable or unfavourable circumstances arise. The unfavourable circumstances cause the abandonment of an intended action. The favourable ones, on the other hand, even produce a desire for an action for which there has not been a desire previously. As, however, God is not subject to accidents which could bring about a change in His will, and is not affected by obstacles and hindrances that might appear or disappear, it is impossible, they argue, to imagine that God is active at one time and inactive at another. He is, on the contrary, always active in the same manner as He is always in actual existence.
Seventh Method. -- The actions of God are perfect; they are in no way defective, nor do they contain anything useless or superfluous. In similar terms Adstotle frequently praises Him, when he says that Nature is wise and does nothing in vain, but makes everything as perfect as possible. The philosophers therefore contend that this existing Universe is so perfect that it cannot be improved, and must be permanent; for it is the result of God's wisdom, which is not only always present in His essence, but is identical with it.
All arguments in favour of the Eternity of the Universe are based on the above methods, and can be traced to one or other of them. The following objection is also raised against Creatio ex nihilo: How could God ever have been inactive without producing or creating anything in the infinite past? How could He have passed the long infinite period which preceded the Creation without producing anything, so as to commence, as it were, only yesterday, the Creation of the Universe? For even if you said, e.g., that God created previously as many successive worlds as the outermost sphere could contain grains of mustard, and that each of these worlds existed as many
