Czesław Miłosz said this quote

Professional Ketman is reasoned thus: since I find myself in circumstances over which I have no control, and since I have but one life and that is fleeting, I should strive to do my best. I am like a crustacean attached to a crag on the bottom of the sea. Over me storms rage and huge ships sail; but my entire effort is concentrated upon clinging to the rock, for otherwise I will be carried off by the waters and perish, leaving no trace behind.