A man can't spend years at one thing and not acquire a habitual attitude towards it quite unlike that of the average beginner. The difference distinguishes the professional from the amateur. It is the way a man looks at things that makes or loses money for him in the speculative markets. The public has the dilettante's point of view toward his own effort. The ego obtrudes itself unduly and the thinking therefore is not deep or exhaustive. The professional concerns himself with doing the right thing rather than with making money, knowing that the profit takes care of itself if the other things are attended to.

—Jesse Livermore