" No.” A look of dawning comprehension. “Ah, that. The regret, is that what you’re talking about? This sense of loss? Yes, he always talked about that, too. It’s a mortal thing, as far as I can tell. The aspect storm is a warp in the fabric of every possible outcome the universe will allow. It gathers in the alternatives like a bride gathering in her gown. For a mortal, those alternatives are mostly paths they’ll never take, things they’ll never do. At some level, the organism seems to know that. "

― Richard K. Morgan , The Steel Remains (A Land Fit for Heroes, #1)