Humor is the mask of wisdom.

Our science has become terrible, our research dangerous, our findings deadly. We physicists have to make peace with reality. Reality is not as strong as we are. We will ruin reality.

A world is in flames, and you are cracking silly jokes.

We are not cave dwellers anymore, we live in the age of technology. When someone needs a car, he does not need to build it. He can buy it. When someone needs a murder, he himself does not need to kill. He can order it.

For a person who is dying only eternity counts.

What the world needs is not redemption from sin but redemption from hunger and oppression; it has no need to pin its hopes upon Heaven, it has everything to hope for from this earth.

Revolutions demand enormous sacrifices and, at the same time, create a new need to change the world again.