It almost seems to me that man was not born to be a carnivore.

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

I live in that solitude which is painful in youth, but delicious in the years of maturity.

You can't solve problems with the same thinking that caused them.

Common sense invents and constructs no less than its own field than science does in its domain. It is, however, in the nature of common sense not to be aware of this situation.

The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a simple datum of experience.

Common sense is nothing more than a deposit of prejudices laid down by the mind before you reach eighteen.