How do we know the keys of the kingdom are important?

The keys of the kingdom given to Peter signify the authority to declare gospel truths, not merely an exclusive power granted to him alone, but to all apostles. In Matthew 16:19, Jesus tells Peter that he will be given the keys of the kingdom, enabling him to bind and loose according to the truth of the gospel. These keys were instrumental during Pentecost when Peter preached and 3,000 were added to the church. Similarly, the ability to open the gospel to the Gentiles was also given to him, demonstrating the importance of these keys in the early church's mission and the authority of the apostles in spreading the faith.