What wonder then that He does not signify the day of the final consummation, when this day which was so near He did not choose to reveal? And with good reason; to the end they may be ever wakeful, and in a state of expectation and earnest heed....
As if then we were banquetting with Christ Himself, and partaking of His table, let us do nothing at random, but let us pass our time in fastings, and prayers, and much sobriety of mind. For if a man who is destined to enter upon some temporal government, prepares himself all his life long, and that he may obtain some dignity, lays out his money, spends his time, and submits to endless troubles; what shall we deserve, who draw near to the kingdom of heaven with such negligence, and both show no earnestness before we have received, and after having received are again negligent? Nay, this is the very reason why we are negligent after having received, that we did not watch before we had received. Therefore many, after they have received, immediately have returned to their former vomit, and have become more wicked, and drawn upon themselves a more severe punishment....
John Chrysostom, Homilies on the Acts of the Apostles, Homily I
