The most important human endeavor is the striving for morality in our actions. Our inner balance and even our very existence depend on it. Only morality in our actions can give beauty and dignity to life.

Raffiniert ist der Herr Gott, aber boshaft ist er nicht. God is subtle, but he is not malicious.

I have always disliked the fierce competitive spirit embodied in that highly intellectual game.

Strange is our situation here upon earth.

Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.

Whoever is devoid of the capacity to wonder, whoever remains unmoved, whoever cannot contemplate or know the deep shudder of the soul in enchantment, might just as well be dead for he has already closed his eyes upon life.

The thinking that got us to where we are is not the thinking that will get us to where we want to be.