Let that therefore abide in you Namely, that doctrine concerning the Father and the Son; which ye have heard from the beginning Of the preaching of the gospel: retain a firm belief of it, and let your minds be so impressed with a sense of its certain truth and infinite importance, that it may have the desired influence on your spirit and conduct. If that which ye have heard, &c., shall remain fixed and rooted in you If you persevere in the faith of the gospel, and show that you do so by your life and conversation; ye also shall continue in the Son and in the Father Genuine members of Christ's mystical body, and consequently in the love of God, and in communion with him. And, to encourage you in this, remember the promise, that he, the Son, hath made to us, if we abide in him, even eternal life.
Related Commentaries of 1 John 2:24
1 John 2:24-25
24 Let that therefore abide in you, which ye have heard from the beginning. If that which ye have heard from the beginning shall remain in you, ye also shall continue in the Son, and in the Father.
25 And this is the promise that he hath promised us, even eternal life.