Metempsychosis Term Analysis

—Here, she said. What does that mean?
He leaned downward and read near her polished thumbnail.
—Metempsychosis?
—Yes. Who’s he when he’s at home?
—Metempsychosis, he said, frowning. It’s Greek: from the Greek. That means the transmigration of souls.
—O, rocks! she said. Tell us in plain words.

His smile faded as he walked, a heavy cloud hiding the sun slowly, shadowing Trinity’s surly front. Trams passed one another, ingoing, outgoing, clanging. Useless words. Things go on same, day after day: squads of police marching out, back: trams in, out. Those two loonies mooching about. Dignam carted off. Mina Purefoy swollen belly on a bed groaning to have a child tugged out of her. One born every second somewhere. Other dying every second.
[…]
Cityful passing away, other cityful coming, passing away too: other coming on, passing on. Houses, lines of houses, streets, miles of pavements, piledup bricks, stones. Changing hands. This owner, that. Landlord never dies they say. Other steps into his shoes when he gets his notice to quit. They buy the place up with gold and still they have all the gold. Swindle in it somewhere. Piled up in cities, worn away age after age. Pyramids in sand.
[…]
No-one is anything.