Paul clarifies that Christ is the one who has written the letter. Alternate translation: "you are a letter that Christ has written" (See: [[rc://en/ta/man/translate/figs-metaphor]] and [[rc://en/ta/man/translate/figs-explicit]])
This can be stated in active form. Alternate translation: "It was written not with ink but it was written by the Spirit of the living God" or "It is not a letter that people wrote with ink but a letter that the Spirit of the living God wrote" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-ellipsis]])
This can be stated in active form. Alternate translation: "It is not a letter that people engraved on stone tablets but a letter that the Spirit of the living God wrote on tablets of human hearts" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-ellipsis]])
Paul speaks of their hearts as if they are flat pieces of stone or clay upon which people engraved letters. (See: [[rc://en/ta/man/translate/figs-metaphor]])