The mind can proceed only so far upon what it knows and can prove. There comes a point where the mind takes a higher plane of knowledge, but can never prove how it got there. All great discoveries have involved such a leap

Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience.

Humiliation and mental oppression by ignorant and selfish teachers wreak havoc in the youthful mind that can never be undone and often exert a baleful influence in later life.

Each possession I own is but a stone around my neck.

The thinking it took to get us into this mess is not the same thinking that is going to get us out of it.

A hundred times every day I remind myself that my inner and outer life are based on the labors of others.

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.