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…He has no rival. For the more truly he consults his own powers, the more difference will his work exhibit from the work of any other.
– Ralph Waldo Emerson