No arts; no letters; no society; and which is worst of all, continual fear, and danger of violent death; and the life of man, solitary, poor, nasty, brutish, and short.

"The act of writing is an act of hope."

There is nothing in the world so irresistibly contagious as laughter and good humor.

Memory is identity... You are what you have done; what you have done is in your memory; what you remember defines who you are.

物理学的美丽在于它能够用简单的原理解释宇宙的复杂性。