Nicomachean Ethics, 胡適致蔡元培，1922.5.10

 Aristotle emphasized the importance of developing excellence (virtue) of character (Greek ēthikē aretē), as the way to achieve what is finally more important, excellent conduct (Greek energeia). As Aristotle argues in Book II of the Nicomachean Ethics, the man who possesses character excellence does the right thing, at the right time, and in the right way.

胡適致蔡元培，1922.5.10