Paul reminds the Corinthian believers that they will receive a new superior body upon death. This body will be suited for eternity and will not have the malfunctions which our present bodies have, causing us pain and misery. You may recall the long chapter of 1 Corinthians 15 where Paul speaks in detail about what our new bodies will be like, but obviously he can only speak in figures of speech! Words do not successfully define what they will be; somewhere I read a few days ago described it as suddenly realising that there is another dimension. Imagine, they wrote, living in a three dimensional world as a two dimensional person: eternity will bring in new dimensions. From living in this TENT of our mortal bodies- Paul revisiting images of the Tabernacle in the wilderness, of Israel's nomadic wanderings, Paul was a tentmaker so knew about them (I reckon he could talk about tents for hours) to living in a HOUSE- the Temple was built firstly by Solomon and remained in the same place for hundreds of years, a solid immovable structure, built to last!
Paul is taking a rather radical approach to death and resurrection as far as Greeks thought. They believed that the soul was imprisoned in the body and released to go where it will upon death. Paul recognised the deep issues behind that philosophy and rejected it. Without new bodies we would be absorbed into the air, no longer with personal identity, no longer made in the image of God, our uniqueness lost for eternity. Why would God do that? Jesus demonstrated that resurrection was of the body as well as the spirit.
Paul also reminds his readers that wherever we are or whatever we do we are to please the Lord. There is no place for anyone in eternity who does not love God! He reminds too that it is not so much about having a fully orthodox theology. but of living as a Christian- looking for opportunities to bless others.