The cares of this world, the temptations of sin, and the appeal of the promises of false teachers can all pull us away from the truth. But those who hold fast to the truth—those in whom the truth abides—receive the promise of eternal that God has made to us.

“Let what you heard from the beginning abide in you. If what you heard from the beginning abides in you, then you too will abide in the Son and in the Father. And this is the promise that he made to us—eternal life.”
(1 John 2:24-25 ESV)

Believing the gospel is a lifelong commitment. While justification is an instantaneous act of God at the moment of conversion, the faith that justifies continues and deepens until one reaches glory. As you continue to cling to the truth in faith, the truth “you heard from the beginning” abides in you. In this passage, John is again appealing to the origin of the faith to establish its reliability.

Matthew Henry comments,

Truth is older than error. The truth concerning Christ, that was at first delivered to the saints, is not to be exchanged for novelties. So sure were the apostles of the truth of what they had delivered concerning Christ, and from him, that after all their toils and sufferings they were not willing to relinquish it. The Christian truth may plead antiquity, and be recommended thereby.

John’s audience was facing false teachers who were promoting “novelties” that distorted the gospel, and he was compelled to remind them of the truth that had been delivered to them. He charged them to not just believe it, but for it to abide in them. The abiding of truth within the believer is not just an intellectual matter but a profoundly spiritual one. John says that if the truth abides in you, “you too will abide in the Son and in the Father.” What you believe determines your spiritual state, both now and in eternity. If anyone separates himself from the truth, he is separated from God. John appeals to his readers to reject the Christ-deniers and their teachings, lest they forfeit their souls.

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