A man who pretends to a knowledge which he has not is like a pygmy wearing giant's clothing, ridiculous: but he who admits Ignorance is like a strong knight, clothed in a well fitting suit of mail, ready to achieve truth. When a man declares openly his ignorance concerning things of which he knows but little, the world listens with increased respect when he speaks of the thing he knows: but when a man claims knowledge of all things, the world doubts mightily that he knows much of anything, and accepts questioningly whatever he says of everything. That which a man does not know harms him not at all, neither does it harm the world; but that which, through a shallow, foolish, self-conceit, he professes to know, when he has at best only a half knowledge, or, in a self destructive vanity, deceives himself into thinking that he knows, betrays him always to the injury of both himself and others. An honest Ignorance is a golden vessel, empty, ready to be filled with wealth but a pretentious or arrogant knowledge is a vessel so filled with worthless trash that there is no room for that which is of value. The world is as full of things to know as it is full of hooks, No man can hope to read all the books in the world. Selection is enforced by necessity. So it is in Knowledge. One should not think that, because a man is ignorant of some things, he is therefore a fool; his ignorance may be the manifestation of a choice wiser than that of the one who elects to sit in judgment upon him. With the passion to know fully aroused; with his mind fretting to grapple with the problem of Life; and his purpose fired to solve the riddle of time; the man succeeded in acquiring this: that he must dare to know little. He came to understand that, while all knowable things are for all mankind to know, no man can know them all; and that the wisest men to whom the world pays highest tribute, are the wisest because they have not attempted to know all, but, recognizing the value of Ignorance, have dared to remain ignorant of much. Intellectual giants they are; intellectual babes they are, also. The man had thought that there was nothing that these men--these wise ones--did not know. He came to understand that even _he_ knew some things of which they were ignorant. So his determination to know all things passed to a determination to know nothing of many things that he might know more of the things that were most closely associated with his life and work. He determined to know the most of the things that, to him, were most vital.