Suddenly
Jesus has left us word: "Watch ye therefore: for ye know not when the Master of the house cometh, at even, or at midnight, or at the cockcrowing, or in the morning: lest coming suddenly He find you sleeping. And what I say unto you I say unto all, Watch." We are waiting and watching for the return of the Master, who is to bring the morning, lest coming suddenly He find us sleeping. What time is here referred to? Not to the revelation of Christ in the clouds of heaven to find a people asleep. No; but to His return from His ministration in the most holy place of the heavenly sanctuary, when He lays off His priestly attire and clothes Himself with garments of vengeance, and when the mandate goes forth: "He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still; and he that is holy, let him be holy still.”
2T 190
Jesus tells us to watch for the day He will leave the Most Holy Place, so, someday, He will let us know when and how to do this.