Augustine of Hippo

Therefore, not to know the times is something different from moral decay and the love of vice. For when the apostle Paul said, "Don't be easily shaken in your mind nor be frightened, neither by word nor by epistle as sent from us, as if the day of the Lord were at hand," he obviously did not want them to believe those who thought the coming of the Lord was already at hand. Neither, moreover, did he want them to be like the wicked servant and say, "My Lord will not be coming for a long time," and deliver themselves over to destruction by pride and immoral behavior. Thus, Paul's desire that they should not listen to false rumors about the imminent approach of the last day was consistent with his wish that they should await the coming of their Lord fully prepared and ready for the journey, with lamps burning.