And after this third valley, where the knowledge of human nature and of the fine feelings which are called virtues is attained, the next step is annihilation. But what we call destruction or annihilation is nothing but change. Neither substance nor form nor spirit, nothing, is absolutely destroyed; it is only changed. But man sometimes does not like to change. He does not like it but he cannot live without it. There is not one single moment of our life when there is no change; whether we accept it or not the change is there.