Religion is the vision of something that stands beyond, behind and within, the passing flux of immediate things; something which is real, and yet waiting to be realized; something which is a remote possibility, and the greatest of present facts; something that gives meaning to all the passes, and yet eludes apprehension; something whose possession is the final good, and yet it is beyond all reach; something which is the ultimate deal, and the hopeless quest.
Alfred North Whitehead – Science and the Modern World. P. 191. (published in 1925)
(Don’t be surprised if the sentences above have striking similarities to ideas mentioned in Brihadaranyaka and Mandukya Upanishads.)