Okay yesterday, I watched a man preach about heaven & earth?

The body is temporal. That is the part that goes back to the elements of the earth from whence it came. The eternal essence which is reconstituted into an eternal body is what lives on after mortal death. Heaven does not exist within our temporal sphere of existence. Our temporal sphere of existence lies within the eternal realms of heaven and hell. That's why we can either make our lives here a heaven or hell of our own making.