Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.

Any trifle is enough to entertain two lovers.

Each one of us must carry within the proof of immortality, it cannot be given from outside of us. To be sure, everything in natureis change but behind the change there is something eternal.

How can you come to know yourself? Never by thinking, always by doing. Try to do your duty, and you'll know right away what you amount to.

The highest goal that man can achieve is amazement.

If nature is your teacher, your soul will awaken.

Self knowledge is best learned not by contemplation, but by action.