These verses are teaching us about the transformation of our bodies in the future. In 1 Corinthians 15:51-53, it talks about how our mortal bodies will be transformed into immortal, imperishable bodies at the time of Christ's return. And in Philippians 3:21, it mentions how our lowly bodies will be transformed to be like Christ's glorious body. Overall, these verses are teaching us about the hope and promise of a future transformation and resurrection for believers in Christ.