Conscientious and careful physicians allocate causes of disease to natural laws, while the ablest scientists go back to medicine for their first principles.

Men become builders by building and lyreplayers by playing the lyre; so too we become just by doing just acts, temperate by doing temperate acts, brave by doing brave acts.

So the good has been well explained as that at which all things aim.

Fear is pain arising from the anticipation of evil.

A courageous person is one who faces fearful things as he ought and as reason directs for the sake of what is noble.

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.

The roots of education are bitter, but the fruit is sweet.