And this is the promise that he hath promised us,.... Either God the Father, who is that God that cannot lie, who in the covenant of his grace, before the world began, made this promise unto his people, even eternal life; which promise, with all others, was put into the hands of Christ, where, with them, it is yea and amen; and also the thing itself promised, where it is hid, and lies safe and secure: or the Son, the Lord Jesus Christ, who has promised it in the Gospel; for this is the sum of the Gospel declaration, that whoever believes in him shall have everlasting life; and this lies in the knowledge of the Father, and of the Son, and in the enjoyment of them, and conformity to them; wherefore the doctrine respecting them ought to be retained, and firmly adhered to.