Paul tells the Corinthians that they are spiritual infants, that they are still worldly. He calls them out because of their quarreling and jealousy.
Paul talks about men's role in God's plan. Verse 6 says, "I planted the seed, Apollos watered it, but God made it grow." Paul tells them how God is the one to follow, not men, because men are just playing their roles.

Paul says the foundation for all things should be Christ, and no one should try to lay a new foundation. Paul says that each man's work built upon this foundation would be tested by daylight and fire. If his work survives, he is rewarded, but if it is burned up, he only escapes.
{{{ Preceding paragraph: foundation of Christ symbolizes belief in Christ Messiah, crucified and raised for the penalty of the sin of mankind. It signifies a rebirth in Christ and a reserved spot in heaven. /// But the work after that signifies the life after becoming a believer in Christ. The things that a person does determine the reward he is given in heaven, not the eternal position of a person. Is it better to spend eternity as one rewarded greatly or as one who had barely escaped? }}}

Paul tells them that they themselves are God's temple, and that to destroy God's temple is to invoke God's anger upon them. He ends the chapter by telling them not to boast in themselves because they have nothing to boast about.

1. Spiritual infants receive milk, not solid food.
2. Spiritual maturity is recognized by deeds and actions/attitudes towards others.
3. Follow God, not men, whether they be godly or not
4. Those who believe get eternal life, but the deeds of a believer determine his reward in heaven
5. Believers are God's temple, and God is angered when His temple is destroyed.
6. The things men boast about are not worthy to be boasted about.

1 Corinthians 3:1