 Quite simply, since our present bodies are perishable, since we're not going to go to heaven in these present bodies, they must be exchanged or transformed into another type of body. In fact, verse 53 makes it clear that a body can die, but it must be exchanged for one that cannot die. There's an old saying that says there's nothing more certain than death and taxes. Well, taxes are certain, but death isn't necessarily certain in light of what Paul says here. Now, Paul says there are...