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 Aristotle 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 years: considering the infinite existence of God, it would be the same as if He had only yesterday commenced the Creation. For when we once admit the beginning of the existence of things after their non-existence, it makes no difference whether thousands of centuries have passed since the beginning, or only a short time. Those who defend the Eternity of the Universe find both assumptions equally improbable. Eighth Method.—The following method is based on the circumstance that the theory implies a belief which is so common to all peoples and ages, and so universal, that it appears to express a real fact and not merely an hypothesis. Aristotle says that all people have evidently believed in the permanency and stability of the heavens; and thinking that these were eternal, they declared them to be the habitation of God and of the spiritual beings or angels. By thus attributing the heavens to God, they expressed their belief that the heavens are indestructible. Several other arguments of the same kind are employed by Aristotle in treating of this subject in order to support the results of his philosophical speculation by common sense. CHAPTER XV In this chapter I intend to show that Aristotle was well aware that he had not proved the Eternity of the Universe. He was not mistaken in this respect. He knew that he could not prove his theory, and that his arguments and proofs were only apparent and plausible. They are the least objectionable, according to Alexander; but, according to the same authority, Aristotle could not have considered them conclusive, after having himself taught us the rules of logic, and the means by which arguments can be refuted or confirmed.