The apostle Paul has prepared the way for his explanation of resurrection by illustrating three things. First he has shown that when we plant a seed it does not resemble the final flower. He has shown also that there are different kinds of bodies -- for example the flesh of men, beasts and fish. Furthermore, he illustrates the principle that bodies have differing degrees of splendour, mentioning particularly the heavenly bodies. The sun outshines the moon; the stars differ from one another.
So it is with the resurrection of the dead. What we are now does not resemble what we shall be. The natural body we have now will become a spiritual body, and this is not to cause amazement for there are different kinds of bodies. The glory, also, that shall be revealed in us is not to be a matter of surprise, for there are degrees of splendour too.
As we die, believers are like a seed sown. We are sown in corruption. That is to say we are decaying humanity. Perhaps we are diseased. We are corrupted by sin. Subsequently our bodies shall be raised without possibility of ever sinning again, ever suffering pain, ever being hurt or hurting another.
We are sown in dishonour. There are many things which have stained our lives. Let us confess the things we have done of which we are ashamed, and let the blood of our Saviour Jesus wash us thoroughly from our iniquity. Then we shall be raised without defilement.
It is sown in weakness; it is raised in power: it is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body (1 Corinthians 15:43,44).
We are sown in weakness. We are never so weak as at the moment of dying. Once we felt we had boundless physical energy with apparently endless emotional resources. Now it is not so. Even if it were inherently possible, which it is not, we could not make our way unaided to heaven, winging our flight to realms of day. But in glory we shall have powers of intellect to participate fully in unceasing eternal worship and to accomplish things not dreamed of before. The things God has in store for us would beggar description even if we knew them now. Our bodies will be raised compatible with such endless glories, for they will endlessly view the glories of our Saviour and the Father.
We are sown natural bodies. We depend on natural laws of gravity, function, and sustenance. It shall not be so then 'for there shall be no night there; and they need no candle, neither light of the sun; for the Lord God giveth them light: and they shall reign for ever and ever'. Our bodies will be raised to receive direct sustaining power from God Himself.