But of that day and hour no one knows, not even the angels in heaven, nor the Son, but only the Father. “Take heed, watch and pray; for you do not know when the time is. “It is like a man going to a far country, who left his house and gave authority to his servants, and to each his work, and commanded the doorkeeper to watch. “Watch therefore, for you do not know when the master of the house is coming–in the evening, at midnight, at the crowing of the rooster, or in the morning– “lest, coming suddenly, he find you sleeping. “And what I say to you, I say to all: Watch!” Mark 13:32-37
At the conclusion of His teaching Christ repeatedly called His disciples to watch, watch, watch. The biblical doctrine of Christ’s second coming is not something to stimulate curiosity and speculation about a timetable of events. It is a summons to spiritual alertness and constant prayer, since we do not know when the Lord will appear.
—- Copied from notes in The Reformation Heritage KJV Study Bible