2 Corinthians 3:1-6 New Revised Standard Version (NRSV)
Ministers of the New Covenant
3 Are we beginning to commend ourselves again? Surely we do not need, as some do, letters of recommendation to you or from you, do we? 2 You yourselves are our letter, written on our[a] hearts, to be known and read by all; 3 and you show that you are a letter of Christ, prepared 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.
4 Such is the confidence that we have through Christ toward God. 5 Not that we are competent of ourselves to claim anything as coming from us; our competence is from God, 6 who has made us competent to be ministers of a new covenant, not of letter but of spirit; for the letter kills, but the Spirit gives life.