But since there is but one aim for the entire state, it follows that education must be one and the same for all, and that the responsibility for it must be a public one, not the private affair which it now is, each man looking after his own children and teaching them privately whatever private curriculum he thinks they ought to study.

Philosophy can make people sick.

Thinking is different from perceiving and is held to be in part imagination, in part judgment

Happiness depends on ourselves.

It is in justice that the ordering of society is centered.

No science ever defends its first principles.

Some vices miss what is right because they are deficient, others because they are excessive, in feelings or in actions, while virtue finds and chooses the mean.