最困难的是在当下富足地生活，而不让它被过去或未来玷污。

Life is ours to be spent, not to be saved.

The only real progress lies in learning to be wrong all alone.

"In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs."

"I don't think about the past. I don't think about the future. I just think about now."