God made these plans for people to become like his Son, and he called those people to be saved. Then he made those people right with himself, and finally, he them gave his glory.
It will be like that with bodies that are raised from the dead. The body that is planted doesn’t last forever; the body that is raised from the dead does.
The words “once more” show that the things that can be shaken (that is, created things) are going to be taken away. Then the things that can’t be shaken will remain.