10. Goods from God, and goods from self, may be compared to gold. Gold that is gold from the inmost, called pure gold, is good gold. Gold alloyed with silver is also gold, but is good according to the amount of the alloy. Less good still is gold that is alloyed with copper. But a gold made by art, and resembling gold only from its color, is not good at all, for there is no substance of gold in it. There is also what is gilded, such as gilded silver, copper, iron, tin, lead, and also gilded wood and gilded stone, which on the surface may appear like gold; but not being such, they are valued either according to the workmanship, the value of the gilded material, or that of the gold which can be scraped off. In goodness these differ from real gold as a garment differs from a man. Moreover rotten wood, dross, or even ordure, may be overlaid with gold; and such is the gold to which pharisaic good may be likened.