The central message of this sermon is that Jesus' second coming creates a sense of urgency and responsibility for Christians to live in light of His impending return. This reality should motivate them to examine their lives, make choices that align with God's will, and communicate the gospel message to others. The speaker emphasizes that when Jesus returns, it will be too late for people to make amends or change their ways; therefore, it is essential to live in obedience to His words now. By keeping and sharing the prophecies of Revelation, Christians can shine a light on the fleeting opportunities they have to help others and lead them to salvation before it's too late. This understanding advances the belief that God is sovereign and His plan for humanity is unfolding according to His timetable, emphasizing the importance of living with eternity in mind and making decisions that align with God's will. The takeaway for listeners is to respond to Jesus' invitation by surrendering their lives to Him now, rather than putting it off until later.