There is no need to believe in anything — that is the fundamental of science. That is the scientific approach to reality: do not believe, inquire. The moment you believe, inquiry stops. Keep your mind open — neither believe nor disbelieve. Just remain alert and search and doubt everything until you come to a point which is indubitable — that's what truth is. You cannot doubt it. It is not a question of believing in it, it is a totally different phenomenon. It is so much a certainty, overwhelming you so much, that there is no way to doubt it.