...one main portion of intellectual education, of the labours of both school and university, is to remove the original dimness of the mind's eye; to strengthen and perfect its vision; to enable it to look out into the world right forward, steadily and truly; to give the mind clearness, accuracy, precision; to enable it to use words aright, to understand what it says, to conceive justly what it thinks about, to abstract, compare, analyze, divide, define, and reason, correctly. There is a particular science which takes these matters in hand, and it is called logic; but it is not by logic, certainly not by logic alone, that the faculty I speak of is acquired. The infant does not learn to spell and read the hues upon his retina by any scientific rule; nor does the student learn accuracy of thought by any manual or treatise. The instruction given him, of whatever kind, if it be really instruction, is mainly, or at least pre-eminently, this - a discipline in accuracy of mind.
His maxim is "a little, but well"; that is, really know what you say you know: know what you know and what you do not know; get one thing well before you go on to a second; try to ascertain what your words mean; when you read a sentence, picture it before your mind as a whole, take in the truth or information contained in it, express it in your own words, and, if it be important, commit it to faithful memory. Again, compare one idea with another; adjust truths and facts; form them into one whole, or notice the obstacles which occur in doing so. This is the way to make progress; this is the way to arrive at results; not to swallow knowledge, but (according to the figure sometimes used) to masticate and digest it.
...both quotes are from The Idea of a University, from "Elementary Studies"