I consider that a man’s brain is originally like a little empty attic, and you have to stock it with such furniture as you choose. A fool takes in all the lumber of every sort that he comes across, so that the knowledge that might be useful to him gets crowded out.

I consider that a man's brain originally is like a little empty attic, and you have to stock it with such furniture as you choose. A fool takes in all the lumber of every sort that he comes across, so that the knowledge which might be useful to him gets crowded out, or at best is jumbled up with a lot of other things, so that he has a difficulty in laying his hands upon it. Now the skillful workman is very careful indeed as to what he takes into his brain-attic. He will have nothing but the tools which may help him in doing his work, but of these he has a large assortment, and all in the most perfect order. It is a mistake to think that that little room has elastic walls and can distend to any extent. Depend upon it there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones.

I consider that a man’s brain originally is like a little empty attic, and you have to stock it with such furniture as you choose.

"Well," he said, "I say, now, as I said then, that a man should keep his little brain-attic stocked with all the furniture that he is likely to use, and the rest he can put away in the lumber-room of this library, where he can get it if he wants it."

Man’s imperfect, limited-capacity brain easily drifts into working with what’s easily available to it. And the brain can’t use what it can’t remember or when it’s blocked from recognizing because it’s heavily influenced by one or more psychological tendencies bearing strongly on it … the deep structure of the human mind requires that the way to full scope competency of virtually any kind is to learn it all to fluency — like it or not.

There are times when I long to sweep away half the things I am expected to learn; for the overtaxed mind cannot enjoy the treasure it has secured at the greatest cost. ... When one reads hurriedly and nervously, having in mind written tests and examinations, one's brain becomes encumbered with a lot of bric-a-brac for which there seems to be little use. At the present time my mind is so full of heterogeneous matter that I almost despair of ever being able to put it in order. Whenever I enter the region of my mind I feel like the proverbial bull in the china shop. A thousand odds and ends of knowledge come crashing about my head like hailstones, and when I try to escape them, theme goblins and college nixies of all sorts pursue me, until I wish – oh, may I be forgiven the wicked wish! – that I might smash the idols I came to worship.

A fool’s brain digests philosophy into folly, science into superstition, and art into pedantry. Hence University education.

A fool takes in everything he comes across, so that there is no room for anything useful to find a place,

Men ought to know that from nothing else but the brain come joys, delights, laughter and sports, and sorrows, griefs, despondency, and lamentations. And by this, in an especial manner, we acquire wisdom and knowledge, and see and hear, and know what are foul and what are fair, what are bad and what are good, what are sweet, and what unsavory; some we discriminate by habit, and some we perceive by their utility.

By this we distinguish objects of relish and disrelish, according to the seasons; and the same things do not always please us. And by the same organ we become mad and delirious, and fears and terrors
assail us, some by night, and some by day, and dreams and untimely wanderings, and cares that are not suitable, and ignorance of present circumstances, desuetude, and unskilfulness. All these things we endure from the brain, when it is not healthy, but is more hot, more cold, more moist, or more dry than natural, or when it suffers any other preternatural and unusual affection.

"His ignorance was as remarkable as his knowledge. Of contemporary literature, philosophy and politics he appeared to know next to nothing. Upon my quoting Thomas Carlyle, he inquired in the naivest way who he might be and what he had done. My surprise reached a climax, however, when I found incidentally that he was ignorant of the Copernican Theory and of the composition of the Solar System. That any civilized human being in this nineteenth century should not be aware that the earth travelled round the sun appeared to be to me such an extraordinary fact that I could hardly realize it. "You appear to be astonished," he said, smiling at my expression of surprise. "Now that I do know it I shall do my best to forget it." "To forget it!" "You see," he explained, "I consider that a man's brain originally is like a little empty attic, and you have to stock it with such furniture as you choose. A fool takes in all the lumber of every sort that he comes across, so that the knowledge which might be useful to him gets crowded out, or at best is jumbled up with a lot of other things so that he has a difficulty in laying his hands upon it. Now the skillful workman is very careful indeed as to what he takes into his brain-attic. He will have nothing but the tools which may help him in doing his work, but of these he has a large assortment, and all in the most perfect order. It is a mistake to think that that little room has elastic walls and can distend to any extent. Depend upon it there comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones." "But the Solar System!" I protested. "What the deuce is it to me?" he interrupted impatiently; "you say that we go round the sun. If we went round the moon it would not make a pennyworth of difference to me or to my work.

When a man’s knowledge is not in order, the more of it he has, the greater will be his confusion.

"It is a question of cubic capacity," said he; "a man with so large a brain must have something in it."

There is a foolish corner in the brain of the wisest man.

Brain: an apparatus with which we think we think.