I claim credit for nothing. Everything is determined, the beginning as well as the end, by forces over which we have no control. It is determined for the insect as well as for the star. Human being, vegetables or cosmic dust, we all dance to an invisible tune, intoned in the distance by a mysterious player.

I am enough of an artist to draw freely from the imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.