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I say the rate and not the time of repair. The busiest man needs no more hours of rest than the idler. Some years ago Professor Patrick, of the Iowa State University, kept three young men awake for four days and nights. When his observations on them were finished, the subjects were permitted to sleep themselves out. All awoke from this sleep completely refreshed, but the one who took longest to restore himself from his long vigil only slept one-third more time than was regular with him.

If my reader will put together these two conceptions, first, that few men live at their maximum of energy, and second, that anyone may be in vital equilibrium at very different rates of energizing, he will find, I think, that a very pretty practical problem of national economy, as well as of individual ethics, opens upon his view. In rough terms, we may say that a man who energizes below his normal maximum fails by just so much to profit by his chance at life; and that a nation filled with such men is inferior to a nation run at higher pressure. The problem is, then, how can men be trained up to their most useful pitch of energy? And how can nations make such training most accessible to all their sons and daughters. This, after all, is only the general problem of education, formulated in slightly different terms.

“Rough” terms, I said just now, because the words “energy” and “maximum” may easily suggest only quantity to the reader’s mind, whereas in measuring the human energies of which I speak, qualities as well as quantities have to be taken into account. Everyone feels that his total power rises when he passes to a higher qualitative level of life.

Writing is higher than walking, thinking is higher than writing, deciding higher than thinking, deciding “no” higher than deciding “yes”–at least the man who passes from one of these activities to another will usually say that each later one involves a greater element of inner work than the earlier ones, even though the total heat given out or the foot-pounds expended by the organism, may be less. Just how to conceive this inner work physiologically is as yet impossible, but psychologically we all know what the word means. We need a particular spur or effort to start us upon inner work; it tires us to sustain it; and when long sustained, we know how easily we lapse. When I speak of “energizing,” and its rates and levels and sources, I mean therefore our inner as well as our outer work.

Let no one think, then, that our problem of individual and national economy is solely that of the maximum of pounds raisable against gravity, the maximum of locomotion, or of agitation of any sort, that human beings can accomplish. That might signify little more than hurrying and jumping about in inco-ordinated ways; whereas inner work, though it so often reinforces outer work, quite as often means its arrest. To relax, to say to ourselves (with the “new thoughters”) “Peace! be still!” is sometimes a great achievement of inner work. When I speak of human energizing in general, the reader must therefore understand that sum-total of activities, some outer and some inner, some muscular, some emotional, some moral, some spiritual, of whose waxing and waning in himself he is at all times so well aware. How to keep it at an appreciable maximum? How not to let the level lapse? That is the great problem. But the work of men and women is of innumerable kinds, each kind being, as we say, carried on by a particular faculty; so the great problem splits into two sub-problems, thus:

(1). What are the limits of human faculty in various directions?

(2). By what diversity of means, in the differing types of human beings, may the faculties be stimulated to their best results?