"Some ancient Greeks were exercised by the old problem of the ship of Theseus: This ship, composed of many planks, sails around from port to port. When in each port, some few of its planks are replaced by highly similar planks. After they are replaced, nothing very interesting ever happens with any of the old planks; they might even be allowed to rot. By the end of a year, say, after calling on many ports, all of the original planks have been replaced. . . . Even with all new planks and all new matter, it will be the same ship"
Read this from a Peter Unger quote over at baggas blog .
Our bodies, of course, are like Theseus ship. Totally new every seven years. Even the atoms that make our bodies up our second hand. Yet the crew remain the same so the ship continues to be Theseus's. We are more than just physical, our bodies simply allow us to be here. What does Paul say..... "The outward man perishes, the inward is renewed."