The Second Discourse on the Resurrection.
For instance, then, the images of our kings here, even though they be not formed of the more precious materials -- gold or silver -- are honoured by all. For men do not, while they treat with respect those of the far more precious material, slight those of a less valuable, but honour every image in the world, even though it be of chalk or bronze. And one who speaks against either of them, is not acquitted as if he had only spoken against clay, nor condemned for having despised gold, but for having been disrespectful towards the King and Lord Himself. The images of God's angels, which are fashioned of gold, the principalities and powers, we make to His honour and glory.