“But it is not the spiritual that is first but the natural, and then the spiritual. The first man was from the earth, a man of dust; the second man is from heaven. As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. I tell you this, brothers: flesh and blood cannot inherit the kingdom of God, nor does the perishable inherit the imperishable.” I For 15:46-50
Adam was created as a natural man, from the dust of the earth, with the ability to sin. He did sin and brought condemnation on all mankind (Romans 5:12). Jesus had to shed His blood on the cross to save mankind through faith in Him and thereby make us men and women fit for heaven. Paul may have presented this scripture to refute a popular idea taught by Plato that the ultimate realities are spiritual, and physical things only represent them, in other words the ideal precedes the real. Paul made it clear that the corrupted physical body precedes the spiritual body which is the ultimate ideal body. The principle is always the corrupt, perishable before the redeemed imperishable.
The bodies we have on earth (flesh and blood) are fitted for an earthly existence and our resurrection bodies will be fitted for living in the spiritual realm. This future body will be so much better than what we have today, with no sickness or death and, most importantly, no capacity for sin. We bear the image and characteristics of a fallen body in this life but will bear the image of Christ in our resurrected body. What a joy to contemplate what is ahead for a Christian in heaven, with a perfect, sinless, eternal, resurrected body like our Savior.