Knowledge is dead; the school, however, serves the living.

If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality.

The more I learn, the more I realize I don't know.

I love Humanity but I hate humans

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 unleashed power of the atom has changed everything except our thinking. Thus, we are drifting toward catastrophe beyond conception. We shall require a substantially new manner of thinking if mankind is to survive.