There are branches of learning and education which we must study merely with a view to leisure spent in intellectual activity, and these are to be valued for their own sake; whereas those kinds of knowledge which are useful in business are to be deemed necessary, and exist for the sake of other things.

Tragedy is an imitation not of men but of a life, an action

It is the mark of an educated mind to be able to entertain a thought without accepting it.

The body is most fully developed from thirty to thirty-five years of age, the mind at about forty-nine.

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

Just as at the Olympic games it is not the handsomest or strongest men who are crowned with victory but the successful competitors, so in life it is those who act rightly who carry off all the prizes and rewards.

Happiness is something final and complete in itself, as being the aim and end of all practical activities whatever .... Happiness then we define as the active exercise of the mind in conformity with perfect goodness or virtue.