All Things Are Wrapped In Appearances

Little of what Heraclitus wrote has survived, and what we do have is obscure, but Fragment 54 is lucid and important: "Latent structure is master of obvious structure." This means that Heraclitus believed that a veil lay over the true landscape. He also may have suspected that time was somehow not what it seemed, because in Fragment 52 he said: "Time is a child at play, playing draughts; a child's is the kingdom." This is indeed cryptic. But he also said, in Fragment 18: "If one does not expect it, one will not find out the unexpected; it is not to be tracked down and no path leads us to it.
— PKD