### 83. Q. What are the keys of the kingdom?

**A**. The preaching of the holy gospel and Christian discipline toward repentance. Both of them open the kingdom of heaven to believers and close it to unbelievers.<sup>1</sup>

<sup>1</sup> [Matt. 16:19](/get-passage/Matthew+16:19); [John 20:22-23](/get-passage/John+20:22-23)