What does Jesus mean when He says 'Behold, I come quickly'?

When Jesus says, 'Behold, I come quickly' in Revelation 22:12 and reiterated in verse 20, it conveys both urgency and assurance. The term 'quickly' signifies that His return will happen unexpectedly and swiftly, urging believers to remain alert and prepared. This statement serves as a reminder that time is fleeting and that believers should not grow complacent or disengaged from their faith. The repeated declarations of Christ's return in Revelation emphasize its certainty; thus, the church is called to be vigilant, actively living out their faith and awaiting the return of their Lord with anticipation and hope.