The truth seems to be, first, that the moments of high excitement, of noblest invention, are rare, and not to be commanded by the will; but, on the other hand, that in order to make the gift of invention produce its full effect in any department of human effort, vast labors of preparation are necessary, and these labors may be pursued as steadily as you like Napoleon I. used to say that battles were won by the sudden flashing of an idea through the brain of the commander at a certain critical instant. The capacity for generating this sudden electric spark was military genius. The spark flashed independently of the will; the General could not win that vivid illumination by labor or by prayer; it came only in the brain of genius from the intense anxiety and excitement of the actual conflict. Napoleon seems always to have counted upon it, always to have believed that when the critical instant arrived the wild confusion of the battle-field would be illuminated for him by that burst of sudden flame. But if Napoleon had been ignorant of the prosaic business of his profession, to which he attended more closely than any other commander, what would these moments of supreme clearness have availed him, or would they ever have come to him at all? If they had come to him, they would have revealed only the extent of his own negligence. Instead of showing him _what to do_, they would have made painfully evident what _ought to have been done_. But it is more probable that these clear moments would never have occurred to a mind unprepared by study. Clear military inspirations never occur to shopkeepers and farmers, as bright ideas about checkmates occur only to persons who have studied chess. The prosaic business, then, of the man of genius is to accumulate that preparatory knowledge without which his genius can never be available, and he can do work of this kind as regularly as he likes. The one fatal mistake which is committed habitually by people who have the scarcely desirable gift of half-genius is "waiting for inspiration." They pass week after week in a state of indolence, unprofitable alike to the mind and the purse, under pretext of waiting for intellectual flashes like those which came to Napoleon on his battle-fields. They ought to remember the advice given by one of the greatest artists of the seventeenth century to a young painter of his acquaintance. "Practise assiduously what you already know, and in course of time other things will become clear to you." The inspirations come only to the disciplined; the indolent wait for them in vain.