The only originality I claim is that for me this truth goes hand in hand with the intellectual certainty that the human spirit is capable of creating in our time a new mentality, an ethical mentality. Inspired by this certainty, I too proclaim this truth in the hope that my testimony may help to prevent its rejection as an admirable sentiment but a practical impossibility. Many a truth has lain unnoticed for a long time, ignored simply because no one perceived its potential for becoming reality.

The Problem of Peace (1954)