So there is no unity in this life; it is a mass of matter continually rushing down, and the whole of this matter you may call one unity, but no more. So is mind; each thought is separate from every other thought; it is only the rushing current that leaves behind the illusion of unity; there is no need of a third substance. This universal phenomenon of body and mind is all that really is; do not posit something behind it. You will find that this Buddhist thought has been taken up by certain sects and schools in modern times, and all of them claim that it is new — their own invention. This has been the central idea of most of the Buddhistic philosophies, that this world is itself all-sufficient; that you need not ask for any background at all; all that is, is this sense-universe: what is the use of thinking of something as a support to this universe? Everything is the aggregate of qualities; why should there be a hypothetical substance in which they should inhere? The idea of substance comes from the rapid interchange of qualities, not from something unchangeable which exists behind them. We see how wonderful some of these arguments are, and they appeal easily to the ordinary experience of humanity — in fact, not one in a million can think of anything other than phenomena.