evil should live together. But thou seest clearly that this present authority and worldly prosperity and dominion are not good of their own nature and by their own will, and have no control over their own actions, cleaving as they do to the worst men, and suffering them to be their lords; for it is certain that the most infamous men often attain to power and honours. If then power of its own nature and by its own might were good, it would never countenance evil, but good men. The same may be looked for in all blessings brought by Fate during our life here, both with respect to powers of mind and to possessions, for at times they fall to the basest of men. Surely no man doubts that he is strong that is seen to perform a feat of strength, just as, if he gives evidence of any other quality, we doubt not but that he really has it. For example, music makes a man a musician, and physic makes him a physician, and logic makes him a logician. Likewise the law of nature prevents good from mixing with evil in a man, and evil with good. Though both be in a man, either is separate from the other, for, nature not allowing contrary things to mingle, the one shuns the other, and strives to be itself alone. Wealth cannot make a miser not covetous, nor sate his boundless greed; nor can power render its owner powerful. Since, therefore, every creature shuns its opposite, and strives amain to repel it, what two things can be more opposed than good and evil, which we never find conjoined?
