If one devalues rationality, the world tends to fall apart.
That which can be asserted without evidence, can be dismissed without evidence.
You cannot conquer a free man. The most you can do is kill him.
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.
Nothing that is worth knowing can be taught.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
Education is the ability to listen to almost anything without losing your temper or your self-confidence.
What could an entirely rational being speak of with another entirely rational being?
If I have seen further it is by standing on the shoulders of Giants.