How do we know Jesus' promise to build the church is true?

Jesus asserts in Matthew 16:18 that He will build His church, a promise underlined by His divine authority and purpose. The assurance of this statement rests in the character of Christ Himself – He is faithful and sovereign. As seen in historical fulfillment, the establishment of the church began at Pentecost and has continued throughout history despite opposition, fulfilling His promise that 'the gates of hell shall not prevail against it.' This indicates that the church’s existence and growth are sovereignly sustained by Christ, allowing His people to confidently trust in His word as true.