Descartes and st. aquinius postulated that since I can convieve of an infinite being, one must exist. But I had some trouble with that, mostly that the phrase "infinite being" is a contradiction in terms. In order to "be" you must be limited to "being", I.e. you could not "not be". So for something to be infinite it must at the same time be and not be.... maybe the secret of the crucifiction nu?