Settle, for sure and universally, what conduct will promote... - Immanuel Kant

"All the interests of my reason, speculative as well as practical, combine in the three following questions: 1. What can I know? 2. What ought I to do? 3. What may I hope?"

"The death of dogma is the birth of morality."

"One who makes himself a worm cannot complain afterwards if people step on him."

"Act only according to that maxim whereby you can at the same time will that it should become a universal law."

"Science is organized knowledge. Wisdom is organized life."