2Corinthians 3:3 You show that you are a letter from Christ, the result of our ministry, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.

When we come to Christ a supernatural event happens in our heart. We reflect Christ. Thus, as Christians we don’t have a belief system. We have Christ dwelling within us. Therefore, are HIS love letter to the world. Thus, believers, the church become a picture of Christ HIMSELF.  This was prophesied in the OT. Commentaries holding to the inerrancy of Scripture cite this verse as the fulfillment of Ezekiel 36:26–27.

Ezekiel 36:26-27  I will give you a new heart and put a new spirit in you; I will remove from you your heart of stone and give you a heart of flesh.  And I will put my Spirit in you and move you to follow my decrees and be careful to keep my laws.

This unequivocally expresses that this promise stated in Ezekiel is now being fulfilled in the church.