The aim of your sermon is to bring across the two warnings from Paul given in the passage. You will be able to comment on the place of circumcision, as well as peer pressure. Try to give some relevant examples to help people see when pressure is positive and when it is negative. Emphasize how the good news of justification through faith in Christ can serve as a shield against unwanted peer pressure. If there is time, briefly comment on the nature of the love that the Spirit produces in the hearts of God’s people.
1 For freedom Christ has set us free; stand firm therefore, and do not submit again to a yoke of slavery.