There is a sense of infinite potentiality in us all, when young, which makes some of us draw up lists of books we intend to read hereafter, and makes most of us think that we can easily acquaint ourselves with all sorts of things which we are now neglecting by studying them out hereafter in the intervals of leisure of our business lives. Such good intentions are hardly ever carried out. The conceptions acquired before thirty remain usually the only ones we ever gain. Such exceptional cases of perpetually self-renovating youth as Mr. Gladstone's only prove, by the admiration they awaken, the universality of the rule. And it may well solemnize a teacher, and confirm in him a healthy sense of the importance of his mission, to feel how exclusively dependent upon his present ministrations in the way of imparting conceptions the pupil's future life is probably bound to be. XV. THE WILL Since mentality terminates naturally in outward conduct, the final chapter in psychology has to be the chapter on the will. But the word 'will' can be used in a broader and in a narrower sense. In the broader sense, it designates our entire capacity for impulsive and active life, including our instinctive reactions and those forms of behavior that have become secondarily automatic and semi-unconscious through frequent repetition. In the narrower sense, acts of will are such acts only as cannot be inattentively performed. A distinct idea of what they are, and a deliberate _fiat_ on the mind's part, must precede their execution. Such acts are often characterized by hesitation, and accompanied by a feeling, altogether peculiar, of resolve, a feeling which may or may not carry with it a further feeling of effort. In my earlier talks, I said so much of our impulsive tendencies that I will restrict myself in what follows to volition in this narrower sense of the term. All our deeds were considered by the early psychologists to be due to a peculiar faculty called the will, without whose fiat action could not occur. Thoughts and impressions, being intrinsically inactive, were supposed to produce conduct only through the intermediation of this superior agent. Until they twitched its coat-tails, so to speak, no outward behavior could occur. This doctrine was long ago exploded by the discovery of the phenomena of reflex action, in which sensible impressions, as you know, produce movement immediately and of themselves. The doctrine may also be considered exploded as far as ideas go.