2 Corinthians 3:2-5

Ye are our epistle, written in our hearts, known and read of all men; being made manifest that ye are an epistle of Christ, ministered by us, written not with ink, but with the Spirit of the living God; not in tables of stone, but in tables that are hearts of flesh. And such confidence have we through Christ to God-ward: not that we are sufficient of ourselves, to account anything as from ourselves; but our sufficiency is from God