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."

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

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

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