The whole problem, in its highest aspects, is a question of will and faith. If I know mind and the nature of mind, and believe in it, I believe with Schleiermacher in eternal youth. If I do not believe in it, then I have given away the best of all means for warding off old age. For the mind can only hold itself erect while trusting in itself. And this is the best argument in the whole business.
But even against the concrete special facts and the observable processes of diminution of psychical powers, and of the disappearance of the whole mental content, we could range other concrete and observable facts, which present the whole problem in quite a different light from that in which naturalism attempts to show it. They indicate that the matter is rather one of the rusting of the instrument to which the mind is bound than an actual decay of the mind itself, and that it is a withdrawing of the mind within itself, comparable rather to sleep than to decay. The remarkable power of calling up forgotten memories in hypnosis, the suddenly re-awakening memory a few minutes before death, in which sometimes the whole past life is unrolled with surprising clearness and detail, the flaming up anew of a rusty mind in moments of great excitement, the great clearing up of the mind before its departure, and many other facts of the same nature, are rather to be regarded as signs that in reality the mind never loses anything of what it has once experienced or possessed. It has only become buried under the surface. It has been withdrawn from the stage, but is stored up in safe treasure-chambers. And the whole stage may suddenly become filled with it again.
The simile of an instrument and the master who plays upon it, which is often used of the relation between body and mind, is in many respects a very imperfect one; for the master does not develop with and in his instrument. But in regard to the most oppressive arguments of naturalism, the influence of disease, of old age, of mental disturbances due to brain changes, the comparison serves our turn well enough, for undoubtedly the master is dependent upon his instrument; upon an organ which is going more and more out of tune, rusting, losing its pipes, his harmonies will become poorer, more imperfect. And if we think of the association between the two as further obstructed, the master becoming deaf, the stops confused, the relation between the notes and pipes altered, then what may still live within him in perfect and unclouded purity, and in undiminished richness, may present itself outwardly as confused and unintelligible, may even find only disconnected expression, and finally cease altogether; so that no conclusion would be possible except that the master himself had become different or poorer. The melancholy field of mental diseases perhaps yields proofs against naturalism to an even greater degree than for it. It is by no means the case that all mental diseases are invariably diseases of the brain, for even more frequently they are real sicknesses of the mind, which yield not to physical but to psychical remedies. And the fact that the mind can be ill, is a sad but emphatic proof that it goes its own way.