All means prove but blunt instruments, if they have not behind them a living spirit.

If you can't explain something simply, you don't know enough about it.

I cannot conceive of a God who rewards and punishes his creatures, or has a will of the type of which we are conscious in ourselves. An individual who should survive his physical death is also beyond my comprehension, nor do I wish it otherwise; such notions are for the fears or absurd egoism of feeble souls.

Gravity is a response to geometry.

The gift of fantasy has meant more to me than my talent for absorbing positive knowledge.

Study and, in general, the pursuit of truth and beauty is the sphere in which we are permitted to remain children all our lives." "Study and, in general, the pursuit of truth and beauty is the sphere in which we are permitted to remain children all our lives.

Stupidity is a personal achievement which transcends national boundaries.