John Gill expounds on 1 John 3:9, emphasizing that those born of God are spiritually regenerated and partake in divine nature, which empowers them to live righteously. He clarifies that while believers may still sin, they do not commit sin as a habitual practice, as the new nature within them opposes sin. This new birth is attributed to the grace of God, and the internal seed of grace ensures that true believers cannot live in sin as unregenerate individuals do. Gill highlights the importance of understanding the distinction between the new man and the old nature, affirming that the regenerate are preserved from sin through the influence of the Holy Spirit. Ultimately, he reassures that the work of God in believers guarantees their perseverance in faith.

John Gill expounds on 1 John 2:19, emphasizing that those who left the church were never truly part of it, despite their initial profession of faith. He clarifies that their departure was not merely physical but indicative of a deeper spiritual disconnect, as they denied core truths about Christ. Gill asserts that true believers, marked by the anointing of the Holy Spirit, will remain steadfast in their faith and fellowship. The apostasy of these individuals serves to reveal their lack of genuine regeneration and alignment with God's elect. Ultimately, this passage reassures believers of their perseverance in faith, contrasting it with the fate of those who fall away.

John Gill asserts the doctrine of the saints' final perseverance, emphasizing that true believers, once saved, cannot ultimately fall away or perish. He argues that this doctrine is firmly rooted in Scripture and aligns with God's immutable nature, wisdom, and faithfulness. Gill refutes opposing views by demonstrating that the examples often cited do not pertain to genuine believers but rather to those who were never truly saved. He highlights that God's promises and the work of Christ ensure the eternal security of the saints, making it impossible for them to be lost. Ultimately, Gill encourages believers to find comfort and assurance in their salvation, as it is secured by God's unchanging love and power.

John Gill emphasizes the doctrine of the perseverance of the saints, asserting that those who are truly regenerated and called by God will ultimately persevere in grace and be saved eternally. He supports this doctrine with numerous scriptural references, illustrating that God's promises, His immutable nature, and the work of Christ ensure that believers will not fall away. Gill explains that the faithful are kept by God's power and that their salvation is secure through the covenant established by Christ. He addresses potential objections to this doctrine, clarifying that true believers cannot ultimately fall away, as their salvation is rooted in God's unchanging love and faithfulness.