The sermon explores the certainty and suddenness of Christ's return, drawing parallels between the days of Noah and the present age to emphasize spiritual readiness. It addresses various eschatological views but focuses on the clear biblical command to watch and prepare rather than attempting to calculate specific dates. The preacher explains the hypostatic union to clarify how Jesus, being fully God and fully man, can know the Father's schedule while remaining unknown to humanity. By examining the Olivet Discourse, the message highlights the eternal separation of believers and unbelievers at the Second Coming. The central call is for believers to live in constant vigilance and holy obedience, anticipating Jesus' unexpected arrival as a thief in the night.