Procrastination is attitude's natural assassin. There's nothing so fatiguing as an uncompleted task

Feed the growing human being, feed him with the sort of experience for which from year to year he shows a natural craving, and he will develop in adult life a sounder sort of mental tissue, even though he may seem to be 'wasting' a great deal of his growing time, in the eyes of those for whom the only channels of learning are books and verbally communicated information.

Science must constantly be reminded that her purposes are not the only purposes and that the order of uniform causation which she has use for, and is therefore right in postulating, may be enveloped in a wider order, on which she has no claim at all.

Theory must mediate between all previous truths and certain new experiences

The minute a man ceases to grow, no matter what his years, that minute he begins to be old.

The absolute things, the last things, the overlapping things, are the truly philosophic concerns; all superior minds feel seriously about them, and the mind with the shortest views is simply the mind of the more shallow man.

If you want to change your life, do it flamboyantly and start immediately.