Imagination is the most powerful force in the universe.

Intelligence is not the ability to store information, but to know where to find it.

Relativity teaches us the connection between the different descriptions of one and the same reality.

I was very pleased with your kind letter. Until now I never dreamed of being something like a hero. But since you've given me the nomination I feel that I am one.

Thinking is to man what flying is to birds. Don’t follow the example of a chicken when you could be a lark.

We cannot get to where we dream of being tomorrow unless we change our thinking today.

I have come to know the mutability of all human relationships and have learned to insulate myself against both heat and cold so that a temperature balance is fairly well assured.