Reading is thinking with some one else's head instead of one's own. But to think for oneself is to endeavour to develop a coherent whole, a system, even if it is not a strictly complete one. Nothing is more harmful than, by dint of continual reading, to strengthen the current of other people's thoughts. These thoughts, springing from different minds, belonging to different systems, bearing different colours, never flow together of themselves into a unity of thought, knowledge, insight, or conviction, but rather cram the head with a Babylonian confusion of tongues; consequently the mind becomes overcharged with them and is deprived of all clear insight and almost disorganised. This condition of things may often be discerned in many men of learning, and it makes them inferior in sound understanding, correct judgment, and practical tact to many illiterate men, who, by the aid of experience, conversation, and a little reading, have acquired a little knowledge from without, and made it always subordinate to and incorporated it with their own thoughts.
The scientific thinker also does this to a much greater extent. Although he requires much knowledge and must read a great deal, his mind is nevertheless strong enough to overcome it all, to assimilate it, to incorporate it with the system of his thoughts, and to subordinate it to the organic relative unity of his insight, which is vast and ever-growing. By this means his own thought, like the bass in an organ, always takes the lead in everything, and is never deadened by other sounds, as is the case with purely antiquarian minds; where all sorts of musical passages, as it were, run into each other, and the fundamental tone is entirely lost.
The people who have spent their lives in reading and acquired their wisdom out of books resemble those who have acquired exact information of a country from the descriptions of many travellers. These people can relate a great deal about many things; but at heart they have no connected, clear, sound knowledge of the condition of the country. While those who have spent their life in thinking are like the people who have been to that country themselves; they alone really know what it is they are saying, know the subject in its entirety, and are quite at home in it.
The ordinary book-philosopher stands in the same relation to a man who thinks for himself as an eye-witness does to the historian; he speaks from his own direct comprehension of the subject.
Therefore all who think for themselves hold at bottom much the same views; when they differ it is because they hold different points of view, but when these do not alter the matter they all say the same thing. They merely express what they have grasped from an objective point of view. I have frequently hesitated to give passages to the public because of their paradoxical nature, and afterwards to my joyful surprise have found the same thoughts expressed in the works of great men of long ago.
The book-philosopher, on the other hand, relates what one man has said and another man meant, and what a third has objected to, and so on. He compares, weighs, criticises, and endeavours to get at the truth of the thing, and in this way resembles the critical historian. For instance, he will try to find out whether Leibnitz was not for some time in his life a follower of Spinoza, etc. The curious student will find striking examples of what I mean in Herbart's Analytical Elucidation of Morality and Natural Right, and in his Letters on Freedom. It surprises us that such a man should give himself so much trouble; for it is evident that if he had fixed his attention on the matter he would soon have attained his object by thinking a little for himself.
But there is a small difficulty to overcome; a thing of this kind does not depend upon our own will. One can sit down at any time and read, but not—think. It is with thoughts as with men: we cannot always summon them at pleasure, but must wait until they come. Thought about a subject must come of its own accord by a happy and harmonious union of external motive with mental temper and application; and it is precisely that which never seems to come to these people.
One has an illustration of this in matters that concern our personal interest. If we have to come to a decision on a thing of this kind we cannot sit down at any particular moment and thrash out the reasons and arrive at a decision; for often at such a time our thoughts cannot be fixed, but will wander off to other things; a dislike to the subject is sometimes responsible for this. We should not use force, but wait until the mood appears of itself; it frequently comes unexpectedly and even repeats itself; the different moods which possess us at the different times throwing another light on the matter. It is this long process which is understood by a ripe resolution. For the task of making up our mind must be distributed; much that has been previously overlooked occurs to us; the aversion also disappears, for, after examining the matter closer, it seems much more tolerable than it was at first sight.