What you sow does not come to life unless it dies (1 Corinthians 15:36). Paul, speaking here in the context of the resurrection of the dead, compares our earthly body to a seed. The seed must be planted, and die, in order for it to eventually become the full-grown plant. Similarly, Paul goes on in the very next verse to insist, our earthly body is only the bare kernel of what our glorified body will be. This is a stunning analogy, with awesome implications for the afterlife!
Behold! I tell you a mystery. We shall not all sleep, but we shall all be changed, in a moment, in the twinkling of an eye, at the last trumpet. For the trumpet will sound, and the dead will be raised imperishable, and we shall be changed (1 Corinthians 15:51-52). Christian, this promise applies to you. If you are a believer in Jesus Christ, then one day you will be eternally and beautifully transformed.