What is this frog and mouse battle among the mathematicians?

Playfullness is the essential feature of productive thought.

Do you believe in immortality? No, and one life is enough for me.

The difference between what the most and the least learned people know is inexpressibly trivial in relation to that which is unknown.

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.

... on principle, it is quite wrong to try founding a theory on observable magnitudes alone. In reality the very opposite happens. It is the theory which decides what we can observe.

God casts the die, not the dice.