The world we have made is a result of the level of thinking we have done thus far.

Success = 1 part work + 1 part play + 1 part keep your mouth shut

The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.

Older men start wars, but younger men fight them.

Whatever there is of God and goodness in the universe, it must work itself out and express itself through us. We cannot stand aside and let God do it.

I always have a high regard for the individual and have an insuperable distaste for violence and clubmanship. All these motives made me into a passionate pacifist and anti-militarist. I am against any nationalism, even in the guise of mere patriotism. Privileges based on position and property have always seemed to me unjust and pernicious, as did any exaggerated personality cult.

A man's moral worth is not measured by what his religious beliefs are but rather by what emotional impulses he has received from Nature during his lifetime.