The one exclusive sign of thorough knowledge is the power of teaching – Aristotle

Change in all things is sweet – Aristotle

The wise man does not expose himself needlessly to danger, since there are few things for which he cares sufficiently; but he is willing, in great crises, to give even his life – knowing that under certain conditions it is not worthwhile to live – Aristotle

Democracy arises out of the notion that those who are equal in any respect are equal in all respects; because men are equally free, they claim to be absolutely equal – Aristotle

The secret to humor is surprise – Aristotle

Pleasure in the job puts perfection in the work – Aristotle