1 John 5:13
13These things I have written to you who believe in the name of the Son of God, that you may know that you have eternal life, and that you may continue to believe in the name of the Son of God.
I write to you who believe in the name of the Son of God, that you may know that you have eternal life. Wesley: in the introduction he said I write; now, I have written. That ye may know with a fuller and stronger assurance that ye have eternal life.
Know as you believe. The writing is for believers, that assurance may be fuller. Knowledge of having life is tied to believing in the name, not to a hidden decree inspected apart from the Son. Abide in what you believe, and know.
Calvin: there ought to be daily progress in faith. He wrote to those who had already believed, so that they might believe more firmly and with greater certainty, and thus enjoy a fuller confidence as to eternal life. Doctrine initiates and confirms. Many remnants of unbelief remain; what we believe is not yet believed except there be fuller confirmation. The way: the office and power of Christ explained. Eternal life is to be sought nowhere else but in Christ. To the faith we have in His name is annexed the hope of salvation: we become children and heirs of God.
Know because God has given eternal life in the Son. Confirmation is more of Christ, not a turn inward to our constancy as the ground. Common ground: written that you may know you have eternal life.
Key contrast The verse marks the fork on assurance. Arminian readers take “know” as the fuller assurance of those who believe and abide (Wesley). Reformed readers take it as confidence that God has given eternal life in the Son, confirmed by seeing more of Christ (Calvin)—not a knowledge that rests on our walk as its foundation.