“I believe that we do not know anything for certain, but everything probably.”
Christiaan Huygens (1629–1695) Dutch mathematician and natural philosopher
Letter to Pierre Perrault, 'Sur la préface de M. Perrault de son traité de l'Origine des fontaines' (1673), Oeuvres Complètes de Christiaan Huygens http://books.google.com/books?id=9IVA7sK_Bh8C (1897), Vol. 7, 298. Quoted in Jacques Roger, The Life Sciences in Eighteenth-Century French Thought, ed. Keith R. Benson and trans. Robert Ellrich (1997), 163