A promise made must be a promise kept.

In cases of this sort, let us say adultery, rightness and wrongness do not depend on committing it with the right woman at the right time and in the right manner, but the mere fact of committing such action at all is to do wrong.

A democracy when put to the strain grows weak, and is supplanted by Oligarchy.

The pleasures arising from thinking and learning will make us think and learn all the more. 1153a 23

What is common to many is least taken care of, for all men have greater regard for what is their own than what they possess in common with others.

Every art and every inquiry, and similarly every action and pursuit, is thought to aim at some good; and for this reason the good has rightly been declared to be that at which all things aim.

Hippocrates is an excellent geometer but a complete fool in everyday affairs.