Some people feel with their heads and think with their hearts.

The human tendency to regard little things as important has produced very many great things.

Above all things expand the frontiers of science: without this the rest counts for nothing.

One of the greatest creations of the human mind is the art of reviewing books without having read them.

What is the good of drawing conclusions from experience? I don't deny we sometimes draw the right conclusions, but don't we just as often draw the wrong ones?

If all mankind were suddenly to practice honesty, many thousands of people would be sure to starve.

Of all the inventions of man I doubt whether any was more easily accomplished than that of a Heaven.