Every thing is not just different from every other thing; every thing is also different from itself. By this statement we don't mean different from any possible representation of that thing, or different now to what it was a moment ago, we mean that a thing, in its being, is solely its difference from itself. In other words, identity does not exist, in itself, except in worlds constructed by the human mind, for example, the world of mathematics. Identity is the wishful thinking of a fearful mind. But even mathematics, when pushed to its limit, confronts infinity: for example, the set of all positive integers is obviously infinite, though bounded at one end. The set of all even positive integers is also infinite yet contains half the numbers of the first set, so there are degrees of infinity. Hence, infinity in a grain of sand.