The structural unity of the parts is such that, if any one of them is displaced or removed, the whole will be disjointed and disยญturbed. For a thing whose presence or absence makes no visible difference is not an organic part of the whole.
AristotleWhere perception is, there also are pain and pleasure, and where these are, there, of necessity, is desire.
AristotleIf happiness is activity in accordance with excellence, it is reasonable that it should be in accordance with the highest excellence.
Aristotle