Ephemeral and Eternal
We all were scattered molecules that danced around the earth, eventually convalescing into a single personhood. Before uniting as one, they existed again and again, uniting into and subsequently breaking from many forms. Bodies are created from eternal particles, reinventing their own existence through new combinations, new vessels that exist on this earth only ephemerally. Once the vessel fades, decays, shatters, the molecules disperse and find new pairings, new meanings.
Thus we all have been many things. Inside of our bodies exist a piece of Caesar's dying breath, molecules from the waters of Earth's first rain, particles from the bones of those long dead. And once we die, once our bodies decay, the vessel that holds these parts will break, scattering the molecules again into the world so that they might find rebirth.