Instruction does much, but encouragement everything.

The day is for mistake and error, sequence of time for success and carrying out. The one who anticipates is master of the day.

Rash combat oft immortalizes man; if he should fall, he is renowned in song; but after-ages reckon not the ceaseless tears which the forsaken woman sheds. Poets tell us not of the many nights consumed in weeping, or of the dreary days wherein her anguished soul vainly yearns to call her loved one back.

Of all thieves, fools are the worst; they rob you of time and temper.

What one has wished for in youth, in old age one has in abundance.

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.

Who is sure of their own motives can in confidence advance or retreat.