How do we know the doctrine of separation at Christ's return is true?

The doctrine of separation at Christ's return finds its grounding in Jesus' own words in Matthew 24, where He states that 'one shall be taken and the other left.' This indicates a definitive divide between the righteous and the unrighteous at the return of Christ. The faithful will be gathered to eternal glory, while those who have rejected Him will remain under judgment. The reality of this separation emphasizes the importance of living a life of integrity and faithfulness to Christ, ensuring that believers cultivate their relationship with Him while actively engaging in good works. The certainty of this division challenges believers to examine their faith and stay prepared for the day of reckoning.