...behind all the discernible laws and connections, there remains something subtle, intangible and inexplicable.

The more I learn, the more I realize I don't know.

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

We cannot despair of humanity, since we ourselves are human beings.

In quitting this strange world he has once again preceded me by a little. That doesn't mean anything. For those of us who believe in physics, this separation between past, present, and future is only an illusion, however tenacious.

It is entirely possible that behind the perception of our senses, worlds are hidden of which we are unaware.

Nature conceals her mystery by her essential grandeur.