Does this sound as if we were again boasting about ourselves? Could it be that, like some other people, we need letters of recommendation to you or from you?
You yourselves are the letter we have, written on our hearts for everyone to know and read.
It is clear that Christ himself wrote this letter and sent it by us. It is written, not with ink but with the Spirit of the living God, and not on stone tablets but on human hearts. 1
We say this because we have confidence in God through Christ.
There is nothing in us that allows us to claim that we are capable of doing this work. The capacity we have comes from God;
it is he who made us capable of serving the new covenant, which consists not of a written law but of the Spirit. The written law brings death, but the Spirit gives life. 2