Goodness Is Fulfillment or Full Actuality

Aquinas: Badness isn't a thing at all; it's not a reality at all. Goodness is fulfillment or actualization of what? And the answer is of the squirrel's nature. A squirrel who can't bury nuts will not do a good job of being a squirrel. It will do a bad job, but this is not a sin on its part.