The intuitive mind is a sacred gift And the rational mind is a faithful servant.
The whole of science is nothing more than a refinement of everyday thinking.
You cannot conquer a free man. The most you can do is kill him.
Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.
A concept is a brick. It can be used to build a courthouse of reason. Or it can be thrown through the window.
It is no small art to sleep: for that purpose you must keep awake all day.
Logic is like the sword–those who appeal to it shall perish by it.
The best brains of the Nation may be found on the last benches of the Classroom
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!
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.