The greatest obstacle to discovery is not ignorance - it is the illusion of knowledge.
The only thing that makes life possible is permanent, intolerable uncertainty: not knowing what comes next.
It is the mark of an educated mind to be able to entertain a thought without accepting it.
The more I live, the more I learn. The more I learn, the more I realize, the less I know.
The man of wisdom is never of two minds; the man of benevolence never worries; the man of courage is never afraid.
The only way to comprehend what mathematicians mean by Infinity is to contemplate the extent of human stupidity.
The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.