“If you crave for Knowledge, the banquet of Knowledge grows and groans on the board until the finer appetite sickens. If, still putting all your trust in Knowledge, you try to dodge the difficulty by specialising, you produce a brain bulging out inordinately on one side, on the other cut flat down and mostly paralytic at that: and in short so long as I hold that the Creator has an idea of a man, so long shall I be sure that no uneven specialist realises it. The real tragedy of the Library at Alexandria was not that the incendiaries burned immensely, but that they had neither the leisure nor the taste to discriminate.... but we may agree that, in reading, it is not quantity so much that tells, as quality and thoroughness of digestion.”

“True opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.”

“I like libraries. It's a comfort that knowledge can be save for so long. That what we learn can be passed on.”

“You thought, as a boy, that a mage is one who can do anything. So I thought, once. So did we all. And the truth is that as a man's real power grows and his knowledge widens, ever the way he can follow grows narrower: until at last he chooses nothing, but does only and wholly what he must do. . . .”

“As the biggest library if it is in disorder is not as useful as a small but well-arranged one, so you may accumulate a vast amount of knowledge but it will be of far less value to you than a much smaller amount if you have not thought it over for yourself; because only through ordering what you know by comparing every truth with every other truth can you take complete possession of your knowledge and get it into your power.”

“If a little knowledge is dangerous, where is the man who has so much as to be out of danger?”