thinks for himself creates a work like a living man as made by Nature. For the work comes into being as a man does; the thinking mind is impregnated from without, and it then forms and bears its child.
Truth that has been merely learned is like an artificial limb, a false tooth, a waxen nose; at best, like a nose made out of another's flesh; it adheres to us only because it is put on. But truth acquired by thinking of our own is like a natural limb; it alone really belongs to us. This is the fundamental difference between the thinker and the mere man of learning. The intellectual attainments of a man who thinks for himself resemble a fine painting, where the light and shade are correct, the tone sustained, the color perfectly harmonized; it is true to life. On the other hand, the intellectual attainments of the mere man of learning are like a large palette, full of all sorts of colors, which at most are systematically arranged, but devoid of harmony, connection and meaning.
Reading is thinking with some one else's head instead of one's own. To think with one's own head is always to aim at developing a coherent whole—a system, even though it be not a strictly complete one; and nothing hinders this so much as too strong a current of others' thoughts, such as comes of continual reading. These thoughts, springing every one of them from different minds, belonging to different systems, and tinged with different colors, never of themselves flow together into an intellectual whole; they never form a unity of knowledge, or insight, or conviction; but, rather, fill the head with a Babylonian confusion of tongues. The mind that is over-loaded
