Quantum mechanics has explained all of chemistry and most of physics.

Scientific progress is measured in units of courage, not intelligence.

I should like to suggest to you that the cause of all the economic troubles is that we have an economic system which tries to maintain an equality of value between two things, which it would be better to recognise from the beginning as of unequal value.

God used beautiful mathematics in creating the world.

A theory with mathematical beauty is more likely to be correct than an ugly one that fits some experimental data.

There is in my opinion a great similarity between the problems provided by the mysterious behavior of the atom and those provided by the present economic paradoxes confronting the world.

Well, in the first place, it leads to great anxiety as to whether it's going to be correct or not ... I expect that's the dominating feeling. It gets to be rather a fever... At age 60, when asked about his feelings on discovering the Dirac equation.