Altogether it will be found that a quiet life is characteristic of great men, and that their pleasures have not been of the sort that would look exciting to the outward eye.

To discover a system for the avoidance of war is a vital need of our civilisation.

There was, I think, never any reason to believe in any innate superiority of the male, except his superior muscle.

If everything must have a cause, then God must have a cause. If there can be anything without a cause, it may just as well be the world as God, so that there cannot be any validity in that argument... The idea that things must have a beginning is really due to the poverty of our imagination.

Even when the experts all agree, they may well be mistaken.

It is impossible to read in America, except on a train, because of the telephone. Everyone has a telephone, and it rings all day and most of the night.

So far I have been speaking of theoretical science, which is an attempt to understand the world. Practical science, which is an attempt to change the world, has been important from the first, and has continually increased in importance, until it has almost ousted theoretical science from men's thoughts.