2 Corinthians 3:3
You people show [i.e., by your conversions] that you are a letter from Christ, delivered by us [i.e., the result of our ministry], not written with ink but with the Holy Spirit of the living God; not on stone tablets [i.e., as in the case with Moses' ministry], but on tablets of the human heart. [See Jer. 31:33; Heb. 8:10].
2 Corinthians 3:7
But if the ministry [of the law] that brings [spiritual] death, being carved in letters on stones, came with [such] splendor that the Israelites could not look at Moses' face because of its radiance [See Ex. 34:29-35], (even though such radiance [eventually] faded away),
Hebrews 8:10
For this is the Agreement that I will make with the people of Israel in the coming days, says the Lord: I will put my laws into their minds, and I will also write them on their hearts. And I will be their God and they will be my people.