What is the highest of all goods achievable by action? ...both the general run of man and people of superior refinement say that it is happiness ...but with regard to what happiness is they differ.

If you prove the cause, you at once prove the effect; and conversely nothing can exist without its cause.

Good has two meanings: it means that which is good absolutely and that which is good for somebody.

Philosophy can make people sick.

The high-minded man must care more for the truth than for what people think.

There are three qualifications required in those who have to fill the highest offices, - (1) first of all, loyalty to the established constitution; (2) the greatest administrative capacity; (3) virtue and justice of the kind proper to each form of government.

The young are permanently in a state resembling intoxication.