Never go to excess, but let moderation be your guide.
Whatever you do, do with all your might.
No deceit is so veiled as that which lies concealed behind the semblance of courtesy.
Friendship is given us by nature, not to favor vice, but to aid virtue.
Not to have knowledge of what happened before you were born is to be condemned to live as a child.
Art is born of the observation and investigation of nature.