The whole of science is nothing more than a refinement of everyday thinking.
You can never be overdressed or overeducated.
People who are more rational don’t perceive emotion less, they just regulate it better.
Nothing in life is to be feared, it is only to be understood. Now is the time to understand more, so that we may fear less.
The cooperative structure never encourages huge bureaucratic systems, for it knows that mammoth bureaucracies cannot be sensitive to the needs of people.
He who opens a school door, closes a prison.
The deepest sin against the human mind is to believe things without evidence.
The only true wisdom is in knowing you know nothing.
To him who looks upon the world rationally, the world in its turn presents a rational aspect. The relation is mutual.
The first rule is not to lose. The second rule is not to forget the first rule.