The vitality of thought is in adventure. Ideas won't keep. Something must be done about them. When the idea is new, its custodians have fervor, live for it, and if need be, die for it.
Alfred North Whitehead, OM (February 15, 1861 December 30, 1947) was a British mathematician who evolved into a philosopher. He was born in Ramsgate, Kent, UK, and died in Cambridge, Massachusetts, USA. He wrote on algebra, logic, foundations of mathematics, philosophy of science, physics, metaphysics, and education. He is the coauthor, along with Bertrand Russell, of the epochal Principia Mathematica.