In educating the young we steer them by the rudders of pleasure and pain

All flatterers are mercenary, and all low-minded men are flatterers.

He who can be, and therefore is, another's, and he who participates in reason enough to apprehend, but not to have, is a slave by nature.

Happiness involves engagement in activities that promote one's highest potentials.

To learn is a natural pleasure, not confined to philosophers, but common to all men.

We may assume the superiority ceteris paribus of the demonstration which derives from fewer postulates or hypotheses - in short, from fewer premises.

All men by nature desire to know. An indication of this is the delight we take in our senses; for even apart from their usefulness they are loved for themselves...