Scarcely anyone who comprehends this theory can escape its magic.

Many of the things you can count, don't count. Many of the things you can't count, really count.

I have never looked upon ease and happiness as ends in themselves. This ethical basis I call the ideal of the pigsty.

Even if you have to go through hell - go without hesitation.

Often in evolutionary processes a species must adapt to new conditions in order to survive. Today the atomic bomb has altered profoundly the nature of the world as we know it, and the human race consequently finds itself in a new habitat to which it must adapt its thinking.

In my view, it is the most important function of art and science to awaken this feeling and keep it alive in those who are capable of it.

I regard class differences as contrary to justice and, in the last resort, based on force.