A man can apply himself of his own free will to reading and learning, while he cannot to thinking. Thinking must be kindled like a fire by a draught and sustained by some kind of interest in the subject. This interest may be either of a purely objective nature or it may be merely subjective. The latter exists in matters concerning us personally, but objective interest is only to be found in heads that think by nature, and to whom thinking is as natural as breathing; but they are very rare. This is why there is so little of it in most men of learning.
