John Gill emphasizes the importance of avoiding evil and actively doing good as outlined in 1 Peter 3:11. He encourages believers to abstain from all forms of evil, including revenge, and to engage in good works motivated by love and faith for the glory of God. Gill highlights the necessity of seeking and pursuing peace with everyone, including enemies, and fostering a peaceful community, particularly within the church. He notes the significance of adhering to both negative and affirmative precepts in living a righteous life. Ultimately, the sermon calls for a commitment to goodness and peace as central tenets of the Christian faith.