Believers have assurance of their regeneration through the presence of the Holy Spirit and the conflict between the old and new nature.
Regeneration is evident in the life of a believer through an internal conflict between the old nature (the flesh) and the new nature (the spirit). As described in 2 Corinthians 5:17, those who are in Christ are new creations. This transformation results in a real struggle against sin, as Paul elaborates in Galatians 5:17, where he contrasts the desires of the flesh with the desires of the spirit. If a person truly possesses the new nature, they will experience this ongoing conflict, which affirms their regeneration. The presence of Christ's Spirit in them compels them toward holiness and reliance on God's Word, further evidencing their new life in Christ.
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