How do we know the doctrine of the church's foundation is true?

The truth of the church's foundation lies in biblical revelation. In Matthew 16:18, Jesus explicitly states that He will build His church upon the rock, which is the truth of His identity as the Messiah. This doctrine is further affirmed by the Apostle Paul, who asserts in 1 Corinthians 3:11 that no other foundation can be laid than that which has been laid, which is Jesus Christ. Thus, our confidence in this doctrine is rooted in both Christ's declarations and the apostolic teachings found in the Scriptures.