Freedom of thought is best promoted by the gradual illumination of men's minds which follows from the advance of science.

The wars fanned the wings of science, and science brought to mankind a thousand blessings, a thousand problems and a thousand perils.

The true sign of intelligence is not knowledge but imagination.

It stands to the everlasting credit of science that by acting on the human mind it has overcome man's insecurity before himself and before nature.

Imagination is more important than knowledge.

I have just got a new theory of eternity.