Geniuses are commonly believed to excel other men in their power of sustained attention . . . But it is their genius making them attentive, not their attention making geniuses of them.

Every time a resolve or a fine glow of feeling evaporates without bearing practical fruit is worse than a chance lost; it works to hinder future resolutions and emotions from taking the normal path of discharge. There is no more contemptible type of human character than that of the nerveless sentimentalist and dreamer, who spends his life in a weltering sea of sensibility and emotion, but who never does a manly concrete deed.

It would probably astound each of them beyond measure to be let into his neighbor's mind and to find how different the scenery there was from that in his own.

The greatest enemy of any one of our truths may be the rest of our truths.

Many persons nowadays seem to think that any conclusion must be very scientific if the arguments in favor of it are derived from twitching of frogs' legs (especially if the frogs are decapitated) and that, on the other hand, any doctrine chiefly vouched for by the feelings of human beings (with heads on their shoulders) must be benighted and superstitious.

Man can alter his life by altering his thinking.

Out of time we cut 'days' and 'nights', 'summers' and 'winters.' We say what, each part of the sensible continuum is, and all these abstract whats are concepts. The intelletual life of man consists almost wholly in his substitution of a conceptual order for the persceptual order in which his experience originally comes.