Each man has his own vocation. The talent is the call. There is one direction in which all space is open to him. He has faculties silently inviting him thither to endless exertion. He is like a ship in a river; he runs against obstructions on every side but one; on that side all obstruction is taken away, and he sweeps serenely over a deepening channel into an infinite sea. This talent and this call depend on his organization, or the mode in which the general soul incarnates itself in him. He inclines to do something which is easy to him, and good when it is done, but which no other man can do. He has no rival.
Ralph Waldo Emerson