Peace cannot be kept by force it can only be achieved by understanding.

I am not only a pacifist but a militant pacifist. I am willing to fight for peace. Nothing will end war unless the people themselves refuse to go to war.

Pure mathematics is, in its way, the poetry of logical ideas.

Politics is for the present, but an equation is for eternity.

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