Playfullness is the essential feature of productive thought.

God does not play dice.

He who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed.

I never allow myself to become discouraged under any circumstances. The three great essentials to achieve anything worthwhile are first, hard work, second, stick-to-ittiveness, third, common sense.

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

If A is a success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut

Put your hand on a hot stove for a minute and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute.

Student is not a container you have to fill but a torch you have to light up.