How do we know Christians are truly saved despite their ongoing sin?

The presence of an internal struggle with sin is a strong indicator of genuine salvation. Paul addresses this struggle in Romans 7, emphasizing that the very fact believers wrestle with sin demonstrates that they have been quickened by the Holy Spirit. If they were not saved, there would be no battle against sin, as the unregenerate heart is at peace with its sinful nature. This conflict assures believers that they are alive in Christ, constantly aware of their flesh's corruption and the desire to pursue holiness. Therefore, their struggle, though challenging, is a mark of the Spirit’s work in their lives and serves as a source of hope.