Not to know of what things one should demand demonstration, and of what one should not, argues want of education.

Hippodamus, son of Euryphon, a native of Miletus, invented the art of planning and laid out the street plan of Piraeus.

A life of wealth and many belongings is only a means to happiness. Honor, power, and success cannot be happiness because they depend on the whims of others, and happiness should be self-contained, complete in itself.

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.

When couples have children in excess, let abortion be procured before sense and life have begun; what may or may not be lawfully done in these cases depends on the question of life and sensation.

All men are alike when asleep.

The misanthrope, as an essentially solitary man, is not a man at all: he must be a beast or a god.