Man has an intense desire for assured knowledge.
The man of science is a poor philosopher.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.
This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.
What you can't imagine, you can't discover.
Many of the things you can count, don't count. Many of the things you can't count, really count.