Put all your eggs into one basket and then watch that basket, do not scatter your shot. The man who is director in a half dozen railroads and three or four manufacturing companies, or who tries at one and the same time to work a farm, a factory, a line of street cars, a political party and a store, rarely amounts to much. He may be concerned in the management of more than one business enterprise, but they should all be of the one kind, which he understands. The great successes of life are made by concentration. A man will never rise if he does only this.
Promotion comes from exceptional work.
Differ from your employers upon what you think his mistakes. You will never make much of a success if you do not learn the needs and opportunities of your own branch much better than your employer can possibly do. Do no such foolish thing. If your employer starts upon a course which you think will prove injurious, tell him so, protest, give your reasons, and stand to them unless convinced you are wrong. Live within your means.