Certainty of being a child of God comes from faith in Christ and the assurance of His promises, not from personal effort or lineage.
To be certain of being a child of God, one must trust in Christ alone for salvation. Romans 9:8 clarifies that true children of God are those who are counted as such through the promise, which is attained by faith. The assurance comes from the belief that God fulfills His promises (Titus 1:1-2) and that salvation is not based on our works, but entirely on His mercy and grace. Furthermore, 1 Peter 1:23 reminds us that we are born again, not of corruptible seed, but of the imperishable Word of God. Therefore, the believer's assurance is anchored in Christ's sacrifice and the transformative power of the Gospel in their life.
Scripture References:
Romans 9:8, Titus 1:1-2, 1 Peter 1:23
Commentary