My body is not a tomb for animals.
Nature never breaks her own laws.
Though I may not . . . be able to quote other authors, I shall rely on that which is much greater and more worthy - on experience.
You must grow in patience when you meet with great wrongs, and they will then be powerless to vex your mind.
The motive power is the cause of all life.
The study of what is excellent is food for the mind and body.