with alien thought is thus deprived of all clear insight, and is well-nigh disorganized. This is a state of things observable in many men of learning; and it makes them inferior in sound sense, correct judgment and practical tact, to many illiterate persons, who, after obtaining a little knowledge from without, by means of experience, intercourse with others, and a small amount of reading, have always subordinated it to, and embodied it with, their own thought.
The really scientific thinker does the same thing as these illiterate persons, but on a larger scale. Although he has need of much knowledge, and so must read a great deal, his mind is nevertheless strong enough to master it all, to assimilate and incorporate it with the system of his thoughts, and so to make it fit in with the organic unity of his insight, which, though vast, is always growing. And in the process, his own thought, like the bass in an organ, always dominates everything and is never drowned by other tones, as happens with minds which are full of mere antiquarian lore; where shreds of music, as it were, in every key, mingle confusedly, and no fundamental note is heard at all.
Those who have spent their lives in reading, and taken their wisdom from books, are like people who have obtained precise information about a country from the descriptions of many travellers. Such people can tell a great deal about it; but, after all, they have no connected, clear, and profound knowledge of its real condition. But those who have spent their lives in thinking, resemble the travellers themselves;
