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>> “That is true, but it is also true that one who has not obtained salvation by completely, wholly, and irreversibly committing trust in Jesus alone, and has not received the indwelling Spirit, will not and cannot endure, but will fail” <<
John’s first epistle gives the cure for our sins, day by day: Confession and repentance!
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You can confess and repent all you want, but without trusting in Jesus, in His cross-death for your sins, and for His Shed Blood to wash away your sins, there is no remission of them. And it is the power of the indwelling Holy Spirit that give you the ability to successfully resist and abandon the habit of sinning. Without Him, you will just keep on, no matter how muh you confess.