"His differs from yours in that it does not need to succeed—only not to fail. And I take that to be a more sound way of doing science than your approach, which is all-or-nothing. For as I grow older and see new men coming into the Royal Society I perceive that though Natural Philosophy may have begun with our generation, it need not end with us. Nor am I alone in thinking so." Daniel now lifted up a sheet he had taken from Locke’s study, and read: "It is of great use to the sailor to know the length of his line, though he cannot with it fathom all the depths of the ocean. It is well he knows that it is long enough to reach the bottom, at such places as are necessary to direct his voyage, and caution him against running upon shoals that may ruin him."