The Aristotelian Essence

Good is not a genus for he cannot be affirmed of anything else. Neither are good, beauty, virtue, science or intelligence. If by good we mean only the quality of goodness, then it is evident that quality cannot be ranked with primary genera. Does this imply that essence is not good? No, it is good but not in the same manner as the first, who is good, not by equality, but by himself. The existence of the Aristotelian essence, although it be always united to essence, is the good itself.