"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?"
"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."
"The death of dogma is the birth of morality."
"Science is organized knowledge. Wisdom is organized life."
"Settle, for sure and universally, what conduct will promote the happiness of a rational being."