‘Despair, or folly?’ said Gandalf. ‘It is not despair, for despair is only for those who see the end beyond all doubt. We do not. It is wisdom to recognize necessity, when all other courses have been weighed, though as folly it may appear to those who cling to false hope. Well, let folly be our cloak, a veil before the eyes of the Enemy!
–J.R.R. Tolkien The Fellowship of the Ring: Being the First Part of The Lord of the Rings (Mariner Books 2012 reissue of the 1954 original), p. 302 (emphasis mine)