I have never obtained any ethical values from my scientific work.

The mathematician knows some things, no doubt, but not those things one usually wants to get from him.

I shall never believe that God plays dice with the world.

I believe, indeed, that overemphasis on the purely intellectual attitude, often directed solely to the practical and factual, in our education, has led directly to the impairment of ethical values.

This change in the conception of reality is the most profound and the most fruitful that physics has experienced since the time of Newton. Refering to James Clerk Maxwell's contributions to physics.

The world is not full of evil because of those who do wrong. It is full of evil because of those who do nothing.

Non-cooperation in military matters should be an essential moral principle for all true scientists.