If thinking is like perceiving, it must be either a process in which the soul is acted upon by what is capable of being thought, or a process different from but analogous to that. The thinking part of the soul must therefore be, while impassable, capable of receiving the form of an object; that is, must be potentially identical in character with its object without being the object. Mind must be related to what is thinkable, as sense is to what is sensible.

We must no more ask whether the soul and body are one than ask whether the wax and the figure impressed on it are one.

It is unbecoming for young men to utter maxims.

We become just by performing just action, temperate by performing temperate actions, brave by performing brave action.

A body in motion can maintain this motion only if it remains in contact with a mover.

What is the essence of life? To serve others and to do good.

All men desire by nature to know.