If one devalues rationality, the world tends to fall apart.
Natural science does not simply describe and explain nature: it is part of the interplay between us and nature.
Go to Heaven for the climate. Hell for the company.
Logic is like the sword–those who appeal to it shall perish by it.
Maybe true travel is not the transportation of the body, but a change of perception, renewing the mind.
I mean, you could claim that anything’s real if the only basis for believing in it is that nobody’s proved it doesn’t exist!
Never memorize something that you can look up.
Anything that gives us new knowledge gives us an opportunity to be more rational.
You cannot conquer a free man. The most you can do is kill him.
Education is the ability to listen to almost anything without losing your temper or your self-confidence.