I didn't mean for everybody to have children,Disguised. I said,if you wish to be immortal.We are alive today because our parents,grand-parents, and all our ancestors had one or more children. When I wrote about "matter", I am saying that in that sense we ARE immortal. "Earth to earth,ashes to ashes" ?
Note the lush plantlife in a cemetery. It is lush because of the bodies buried beneath. Birds,other animals, insects, etc., feed on the plants. Ergo, we live again.The same with scattering ashes. Re-incarnation does not mean that we come back as another human. (Perhaps, in spirit!) It means that life goes on.