Concerning the Ten Commandments, which are the Heads of the Law (65-67)

Let us, therefore, fix deeply in ourselves this first commandment as the most sacred of all commandments, to think that there is but one God, the most highest, and to honour him alone; and let not the polytheistical doctrine ever even touch the ears of any man who is accustomed to seek for the truth, with purity and sincerity of heart;

for those who are ministers and servants of the sun, and of the moon, and of all the host of heaven, or of it in all its integrity or of its principal parts, are in grievous error; (how can they fail to be, when they honour the subjects instead of the prince?) but still they sin less grievously than the others, who have fashioned stocks, and stones, and silver, and gold, and similar materials according to their own pleasure, making images, and statues, and all kinds of other things wrought by the hand; the workmanship in which, whether by statuary, or painter, or artisan, has done great injury to the life of man, having filled the whole habitable world.

For they have cut away the most beautiful support of the soul, namely the proper conception of the ever-living God; and therefore, like ships without ballast, they are tossed about in every direction for ever, being borne in every direction, so as never once to reach the haven, and never to be able to anchor firmly in truth, being blind respecting that which is worth seeing, and the only object as to which it is absolutely necessary to be sharp-sighted;