Even so is it with immediate research, in its relation to continuing military study, in the perfecting of instructorship. That which gives an officer power, and conviction, on the platform, or before a group, is not the thing which he learned only yesterday, having been compelled to read it in a manual or other source, but the whole body of this thought and philosophy, as it may be directed toward the invigorating of any presentation of any subject. If he forms the habit of careful reflection, then almost everything that he reads and hears other people say that arouses his own interest becomes grist for his mill. Like 10 years in the penitentiary, it's easy to say but hard to do. So much time, seemingly, has to be wasted in profitless study to find a few kernels amid much chaff. Napoleon said at one point that the trouble with books is that one must read so many bad ones to find something really good. True enough but, even so, there are perfectly practical ways to advance rapidly without undue waste motion. Consider this: Among one's superiors there are always discriminating men who have "adopted" a few good books after reading many bad ones. When they say that a text is worthwhile, it deserves reading and careful study. The junior who starts building a working library for his professional use cannot do better than to consult those older men who are scholars as well as leaders, and ask them to name five or six texts which have most stimulated their thought. It comes as a surprising discovery that some of the titles which are recommended with the greatest enthusiasm are not among the so-called classics on war. The well-read man need not have more than a dozen books in his home, provided that they all count with him, and he continues to pore over them and to ponder the weight of what is said. On the other hand, the ignorant man is frequently marked by his bookshelf stocked with titles, not one of which suggests that he has any professional discernment. The notebook habit is invaluable, nay, indispensable, to any young officer who is ambitious to perfect himself as an instructor. Most men who are distinguished for their thinking ability are inveterate keepers of scrapbooks and of reference files where they have put clippings and notes which jogged their own thoughts. This is not a cheap device leading to the parroting of other men; the truth is that the departure line toward original thinking by any man is established by the mental energy which he acquires by imaginative observation of other men's ideas.