Change a virtue in its circumstances find it becomes a vice; change a vice in its circumstances, and it becomes a virtue. Regard the same quality from two sides; on one it is a fault, on the other a merit. The essential of a man is found concealed far below these moral badges.

The more I study the things of the mind the more mathematical I find them. In them as in mathematics it is a question of quantities; they must be treated with precision. I have never had more satisfaction than in proving this in the realms of art, politics and history.

History is nothing but a problem of mechanics applied to psychology.

I wish to reproduce things as they are or as they would be even if I myself did not exist.

We study ourselves three weeks, we love each other three months, we squabble three years, we tolerate each other thirty years, and then the children start all over again.

For thirty centuries, from her sacred seat the cat looked down, and crouching at her feet, beheld the race of conquering Pharaohs kneel.

Change a virtue in its circumstances find it becomes a vice; change a vice in its circumstances, and it becomes a virtue. Regard the same quality from two sides; on one it is a fault, on the other a merit. The essential of a man is found concealed far below these moral badges.