6:13
“Food for the stomach and the stomach for food”. This was probably some phrase quoted by the Corinthians and used as an excuse for sexual indulgence. “And God will destroy both ...” The next part of the verse is alluding to our resurrection bodies. The body is important, and what we do with our bodies is important. Much of Greek thought separated the body and spirit, no such thought is found in the Bible. Our bodies matter. We are to use them in the way that God intended, and God did not intend them for sexual immorality. This sought of thinking is offensive to the world, but nevertheless the world is wrong. The Bible sees the body as holy, so we are to treat it as such.
In debates on abortion the saying is often “it’s the woman’s body”. No it isn’t, our bodies belong to God, we belong to God. And with regard to sexual activity, our body does not belong to us, it belongs to the Lord, so we must follow His instructions, which are that sex is intended only for a man and a woman in marriage, and in no other context.
6:14
What has the resurrection got to do with sexual morality? Everything! Much Greek thought denigrated the body, saying it was the spirit that really mattered. This could lead to one of two extremes, either promoting sexual immorality, or asceticism. The Bible is unique in that it places great value on the body, this is shown in that it matters how we treat our bodies now, and what we do with them, and by the fact that we will be raised with new bodies. Many liberals talk about a spiritual resurrection. This is wrong on two counts. First the simple fact that Jesus did rise bodily from the dead and the gospels clearly teach this, secondly it is a deeply unbiblical notion. The body matters and the body is holy! See how much sexual immorality denigrates the body.