The deepest sin against the human mind is to believe things without evidence.
Rationality attracts conscientious humans, whereas mysticism attracts fools.
Go to Heaven for the climate. Hell for the company.
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!
Education consists mainly of what we have unlearned.
The test of a first rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.
To him who looks upon the world rationally, the world in its turn presents a rational aspect. The relation is mutual.
Anything that gives us new knowledge gives us an opportunity to be more rational.
If one devalues rationality, the world tends to fall apart.
The whole of science is nothing more than a refinement of everyday thinking.