The whole interest of my reason, whether speculative or practical, is concentrated in the three following questions: What can I know? What should I do? What may I hope? (Critique of Pure Reason
What can I know? What ought I to do? What can I hope?
Science is organized knowledge. Wisdom is organized life.
Seek not the favor of the multitude; it is seldom got by honest and lawful means. But seek the testimony of few; and number not voices, but weigh them.
Ingratitude is the essence of vileness.
Happiness is not an ideal of reason, but of imagination.