At that time the kingdom of heaven will be like ten students waiting for a professor to return to his office. They needed his signature to add his course, and the forms were due early the next day. Five were wise and five were foolish. The wise ones brought something to eat while they waited, but the foolish ones did not. The professor was a long time in coming, and as they waited all afternoon, they got very hungry. The foolish ones said, "Give us some of your food." But the wise ones answered, "No, we only brought enough for ourselves, and there isn't enough to share. Go to the cafeteria and buy something." But while they were on their way to the cafeteria, the professor arrived. He signed the forms of those who were waiting, then locked his office and went home. Later that evening, the others telephoned him at home and said, "Sir! Sir! Come back and sign our forms." But he replied, "I tell you the truth, you are not my students." Therefore keep watch, because you do not know the day or the hour.