Nature will not forgive those who fail to fulfill the law of their being. The law of human beings is wisdom and goodness, not unlimited acquisition.

A civilization in which there is not a continuous controversy about important issues is on the way to totalitarianism and death

...the fullest development of the highest powers of men can be achieved only in a world of peace.

Nobody can decide for himself whether he is going to be a human being. The only question open to him is whether he will be an ignorant undeveloped one or one who has sought to reach the highest point he is capable of attaining.

On the principle laid down by Gilbert and Sullivan that when everybody is somebody, nobody is anybody; if everybody is abnormal, we don't need to worry about anybody.

...The task is overwhelming, and the chance is slight. We must take the chance or die.

Education is a kind of continuing dialogue, and a dialogue assumes different points of view.