It is no small art to sleep: for that purpose you must keep awake all day.
Rationality attracts conscientious humans, whereas mysticism attracts fools.
Maybe true travel is not the transportation of the body, but a change of perception, renewing the mind.
Man once surrendering his reason, has no remaining guard against absurdities the most monstrous, and like a ship without rudder, is the sport of every wind.
The deepest sin against the human mind is to believe things without evidence.
Education is the ability to listen to almost anything without losing your temper or your self-confidence.
Education is the most powerful weapon which you can use to change the world.
People who are more rational don’t perceive emotion less, they just regulate it better.
Go to Heaven for the climate. Hell for the company.
Never memorize something that you can look up.