1 Corinthians 1-7

Paul starts off by telling the followers of Christ that they should be like minded.  He explains that all true saints are perfectly united in the same mind and in the same judgment.  This means that there should not be a separate set of standards for Christians, but their beliefs and convictions should be the same and be what Jesus taught.  Paul then tell that those who follow Christ should preach the gospel and in doing so they would save souls.  Paul also explains that it is not only the most religious or most prominent people who should be preaching the gospel, but anyone who believes in the gospel and has been converted to Jesus's church.  
Paul then goes on to explain that it is the spirit that will be with us as we preach the gospel.  The spirit will reveal what needs to be said when teaching others.  Those who are "natural men" will not be able to receive the gospel, because they are hardened against it.  He then goes on to talk about the milk and the meat.  When you have a baby you feed them milk until they are old enough to eat real food or "meat."  This is just like followers of Christ.  Paul was teaching them the "easier" gospel principles first.  He was giving them the milk of the gospel.  He said they were not ready for the meat.  Paul explains that all of us our temples unto God.  He says that God dwells in each of us and that we should not defile ourselves.