We are all made of "star stuff"- the original hydrogen, and most of the other atoms generated eons ago in some stupendous explosion of a supernova. Our existence may be considered to be an assembly of these various atoms into the molecules which constitute you, me, Earth, and all the animals and things that surround us. When we die, these are all returned to some place in this universe - perhaps to become part of some other intelligent entity eons from now.
It is possible to say, then, that we only "borrow" the building blocks of which we are made. Derek's molecules are therefore in the process of being returned to where they came from. This resonates with me.
(pictured by the Hubble Space Telescope)
We'll all return what we borrowed.