If a being has something unique about it, then its function and its good depend on this unique aspect.
If a being has something unique about it, then its function and its good depend on this unique aspect.
A knife cuts, a heart pumps blood, and a human reasons. In each case, the unique aspect gives us the function and proper end of the being.
But what if you're the only person who can wiggle your ears. Then does your function and good consist in wiggling your ears?
If a being has something unique about it, then its function and its good depend on this unique aspect.
Aristotle seems to argue this way.