‘It is sown in corruption’ – in sickness, in ageing, in decay, in disgust so that it is put out of sight in the ground – Abraham wished to bury his dead [his beloved Sarah] out of his sight (Genesis 23:4) – and after death the body rots, and experiences corruption. You sow a body, subject to corruption, which no one on earth has any ability to raise back to life.
If we trust in Christ, we die and our spirits leave their bodies behind, and they go to the paradise of Christ, which is wonderful. But something even better awaits us. On the return of Christ at the last day, when bodies are resurrected, then for believers they are glorious and pure. It is sown in corruption; it is raised with no more sickness, no more deterioration, no more decay, no more ability to die.