Why is the concept of Christ’s return significant in Christianity?

The return of Christ is a central theme in Christian eschatology, as He will return to judge the living and the dead and purify His church from all that defiles it. This expectation urges believers to live holy lives, as referenced in Malachi 3:2, which asks, 'Who can endure the day of His coming?' With the cleansing of the temple serving as a foreshadowing of His return, Christians are reminded to remain vigilant and spiritually prepared. The coming day will separate the genuine worshipers from those who merely wear the name of Christ without a transformed heart, affirming the importance of living out one’s faith with sincerity and fruitfulness.