(a) THE STUDENT MUST DISTINGUISH CLEARLY BETWEEN READING AND UNDERSTANDING.—Reading alone, no matter how extensive, or how retentive the memory, will not give wisdom or power.
"Who reads
Incessantly, and to his reading brings not
A spirit and judgment equal or superior
Uncertain and unsettled still remains,
Deep versed in books, and shallow in himself."
No doubt every one finds himself at times reading merely words or phrases without understanding them, reflecting about them, or translating them into terms which are intelligible to his understanding. Such reading is worse than useless; it leads to actual mental injury. Whenever we find ourselves doing this we should therefore arouse ourselves, make an effort of will, and concentrate our attention upon the subject, insisting upon understanding it. If for any reason we are unable to do this, we should close the book, take some exercise or recreation, or at any rate do something else, for we are not at the moment fitted for study. We might as well eat sawdust and deceive ourselves with thinking that we are taking nourishment. It is not what is read or what is remembered, but only what is understood, that gives power,
"In this quest of knowledge ... there are two faults to be shunned—one, the taking of unknown things for known, and giving an assent to them too hastily, which fault he who wishes to escape (and all ought so to wish) will give time and diligence to reflect on the subjects proposed for his consideration. The other fault is that some bestow too great zeal and too much labor on things obscure and difficult, and at the same time useless."—Cicero: de Officiis.
(b) THE STUDENT MUST CLEARLY DISTINGUISH MERE FACTS FROM CONCLUSIONS OR OPINIONS.—Mere facts, some of which may be the result of laborious investigation, may be accepted without verification, if the authority is good. When the student reads that the river Nile rises in Equatorial Africa, flows in a northerly direction through Egypt into the Mediterranean sea, he cannot verify this statement nor reason out that it must be so. It is a mere fact and a name, and he simply accepts it, perhaps looking at the map to fix the fact in his mind. So, too, if he reads that the atomic weight of oxygen is 16, or that a cubic foot of water weighs 62.4 pounds, he cannot be expected to perform the experiments necessary to verify these statements. If he were to do this throughout his reading, he would have to make all the investigations made in the subject since man has studied it, taking no advantage of the labor of others.
Very different are conclusions or opinions deduced from facts; and logical conclusions are very different from mere opinions. The facts may be sufficient to prove logically a certain conclusion. On the other hand, the facts may simply give reasonable ground, or appear to give reasonable ground, for a certain opinion, though they may fall far short of demonstration. The student must, therefore, discriminate constantly between mere statements of facts, necessary conclusions which follow therefrom, and mere opinions which they seem to render reasonable.
Some conclusions also, like those of mathematics or logic, may be arrived at by the unaided reason without the previous accumulation of facts deduced from experiments or observation. Such truths or conclusions should be distinguished from those which are based upon facts, experiments or observation. If the student reads, therefore, that the sum of the angles of a plane triangle is equal to two right angles, he should see that this is not a mere fact, but an inevitable truth, the reason for which he should perceive, and not accept simply because he reads it.
The continual exercise of this discrimination, which comes from an attitude of mental courage and independence, is an essential of proper study.