The art of being wise is the art of knowing what to overlook.

The most immutable barrier in nature is between one man's thoughts and another's.

Tension is a habit. Relaxing is a habit. Bad habits can be broken, good habits formed.

Every time a resolve or a fine glow of feeling evaporates without bearing practical fruit is worse than a chance lost; it works so as positively to hinder future resolutions and emotions from taking the normal path of discharge.

In the deepest heart of all of us there is a corner in which the ultimate mystery of things works sadly.

If you only care enough for a result, you will almost certainly attain it. Only you must, then, really wish these things, and wish them exclusively, and not wish at the same time a hundred other incompatible things just as strongly.

In teaching, you must simply work your pupil into such a state of interest in what you are going to teach him that every other object of attention is banished from his mind; then reveal it to him so impressively that he will remember the occasion to his dying day; and finally fill him with devouring curiosity to know what the next steps in connection with the subject are.