Concerning the Ten Commandments, which are the Heads of the Law (80-82)

Therefore, God, removing out of his sacred legislation all such impious deification of undeserving objects, has invited men to the honour of the one true and living God; not indeed that he has any need himself to be honoured; for being all-sufficient for himself, he has no need of any one else; but he has done so, because he wished to lead the race of mankind, hitherto wandering about in trackless deserts, into a road from which they should not stray, that so by following nature it might find the best end of all things, namely, the knowledge of the true and living God, who is the first and most perfect of all good things; from whom, as from a fountain, all particular blessings are showered upon the world, and upon the things are people in it.

Having now spoken of the second commandment to the best of our ability, let us proceed to investigate the one which follows with accuracy, as is pointed out by the order in which they come.

The next commandment is, "not to take the name of God in vain." Now the principle on which this order or arrangement proceeds is very plain to those who are gifted with acute mental vision; for the name is always subsequent in order to the subject of which it is the name; being like the shadow which follows the body.