Mathematics should be mixed not only with physics but with ethics.

If you indulge in long periods, you must be sure to have a snapper at the end.

If I seem to boast more than is becoming, my excuse is that I brag for humanity rather than for myself.

Any nobleness begins at once to refine a man's features, any meanness or sensuality to imbrute them.

The cart before the horse is neither beautiful nor useful. Before we can adorn our houses with beautiful objects the walls must bestripped, and our lives must be stripped, and beautiful housekeeping and beautiful living laid for a foundation.

The scenery when it is truly seen reacts on the life of the seer.

It appears to be a law that you cannot have a deep sympathy with both man and nature.