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.

Read 2 Corinthians 3:3 Using Other Translations

Forasmuch as ye are manifestly declared to be the 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 fleshy tables of the heart.
And you show that you are a letter from Christ delivered by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts.
Clearly, you are a letter from Christ showing the result of our ministry among you. This “letter” is written not with pen and ink, but with the Spirit of the living God. It is carved not on tablets of stone, but on human hearts.