To the vast majority of men nature appears to be only a changing, whirling, combining, mingling mass of change. Few of us ever have a glimpse of the calm sea behind. For us it is always lashed into waves; this universe appears to us only as a tossing mass of waves. Thus we find these two opinions. One is that there is something behind both body and mind which is an unchangeable and immovable substance; and the other is that there is no such thing as immovability or unchangeability in the universe; it is all change and nothing but change. The solution of this difference comes in the next step of thought, namely, the non-dualistic.