I believe there is no source of deception in the investigation of nature which can compare with a fixed belief that certain kinds of phenomena are IMPOSSIBLE.

Since you make evil or good by your own thoughts, it is your ruling of your thoughts which proves to be your principal concern.

The unrest which keeps the never stopping clock of metaphysics going is the thought that the nonexistence of this world is just as possible as its existence.

The further limits of our being plunge, it seems to me, into an altogether other dimension of existence from the sensible and merely understandable world. Name it the mystical region, or the supernatural region, whichever you choose. So far as our ideal impulses originate in this region (and most of them do originate in it, for we find them possessing us in a way for which we cannot articulately account), we belong to it in a more intimate sense than that in which we belong to the visible world, for we belong in the most intimate sense wherever our ideals belong.

Seek out that particular mental attribute which makes you feel most deeply and vitally alive.

In youth we may have an absolutely new experience, subjective or objective, every hour of the day. Apprehension is vivid, retentiveness strong, and our recollections of that time, like those in a time spent in rapid and interesting travel, are of something intricate, multitudinous, and long-drawn-out. But as each passing year converts some of this experience into automatic routine which we hardly note at all, the days and the weeks smooth themselves out in recollection to a contentless unit, and the years grow hollow and collapse.

Man's chief difference from the brutes lies in the exuberant excess of his subjective propensities. Prune his extravagance, sober him, and you undo him.