The progress of science is the discovery at each step of a new order which gives unity to what had seemed unlike.

Many theories of the ancient world seem terribly childish today, a hodge-podge of fables and false comparisons.But our theories will seem childish five-hundred years from now.Every theory is based on some analogy, and sooner or later the theory fails because the analogy turns out to be false. A theory in its day helps to solve the problems of the day.

The hand is the cutting edge of the mind.

The idea that the universe is running down comes from a simple observation about machines. Every machine consumes more energy than it renders.

It's a sort of curious phenomenon that God is somehow not quite as nice as the devil; the devil doesn't punish you for behaving well, but God punishes you for behaving badly.

Science has nothing to be ashamed of even in the ruins of Nagasaki. The shame is theirs who appeal to other values than the human imaginative values which science has evolved.

The human baby, the human being, is a mosaic of animal and angel.