I used often to go to America during Prohibition, and there was far more drunkenness there then than before; the prohibition of pornography has much the same effect.

There lies before us, if we choose, continual progress in happiness, knowledge and wisdom. Shall we instead choose death, because we cannot forget our quarrels? I appeal as a human being to human beings; remember your humanity, and forget the rest.

Against my will, in the course of my travels, the belief that everything worth knowing was known at Cambridge gradually wore off. In this respect my travels were very useful to me.

When we look at a rock what we are seeing is not the rock, but the effect of the rock upon us.

Science can teach us, and I think our hearts can teach us, no longer to look around for imaginary supporters, no longer to invent allies in the sky, but rather to look to our own efforts here below to make the world a fit place to live.

One of the most powerful of all our passions is the desire to be admired and respected.

The time has come, or is about to come, when only large-scale civil disobedience, which should be nonviolent, can save the populations from the universal death which their governments are preparing for them.