John Gill emphasizes the significance of internal peace and tranquility of mind, distinguishing it from external peace that may be experienced in society or among individuals. He explains that true peace is a spiritual state achieved through the work of the Holy Spirit, who comforts and leads believers to the blood and righteousness of Christ, ultimately resulting in forgiveness and a tranquil conscience. Gill highlights that this peace is a gift from God, available only to those who are justified and have faith in Christ, and it is characterized by its permanence and ability to withstand life's tribulations. He encourages believers to seek this peace through the truths of the gospel and the love of God, which dispels fear and anxiety.