Paul questions his readers to determine if they are calling for letters of recommendation. His response is to point out that they have hearts of flesh, engraved on the surface by God, and those same engravings are also on Paul's heart. Paul answers his question from above in Chapter 2 with his amazing statement that God has made us adequate for all things! Then Paul turns to focus on the inner heart, not the external practices, for that lines up with the New Covenant that Ezekiel introduced and Jesus Modeled.
