I know not any season of life that is past more agreeably than virtuous old age.

Let a man practice the profession which he best knows.

Virtue is a habit of the mind, consistent with nature and moderation and reason.

True law is right reason in agreement with nature;...it summons to duty by its commands, and averts from wrongdoing by its prohibitions... It is a sin to try to alter this law, nor is it allowable to attempt to repeal any part of it, and it is impossible to abolish it entirely.

That he who hath the loan of money has not repaid it, and he who has repaid has not the loan; but he who has acknowledged a kindness has it still, and he who has a feeling of it has requited it.

War should be undertaken in such a way as to show that its only object is peace.

The wise are instructed by reason, average minds by experience, the stupid by necessity and the brute by instinct.