How do we know the new creation in Christ is true?

Paul explains that when someone is in Christ, they are a new creation (2 Corinthians 5:17). This new creation is a work of God, much like the original creation. Just as Adam could not create himself, believers cannot make themselves righteous; it is solely the work of the Holy Spirit. The new man referred to in Ephesians 4:24 speaks of a spiritual creation that embodies righteousness and true holiness. This transformation is evidential in a believer's life through a changed lifestyle and desires, aligning with God's will. Therefore, the truth of the new creation is confirmed through both scripture and the observable changes in the lives of believers.