Who are the “all” to whom he says this if not his elect and his beloved, the members of his body which is the church? Therefore, he said this not only to those who then heard him speaking, but also to those who came after them and before us, as well as to us and to those who will come after us until his final coming. Is that day going to encounter only those currently living, or is anyone likely to say that these words are also addressed to the dead, when he says: “Watch, lest he comes suddenly and finds you asleep?” Why, then, does he say to all what concerns only those who will then be living? For that day will come to every single one, when the day comes for him to leave this life, such as it is, to be judged on the last day. For this reason, every Christian ought to watch lest the coming of the Lord find him unprepared. But the last day will find unprepared anyone whom this day will find unprepared. This at least was certainly clear to the apostles. Even if the Lord did not come in their times, while they were still living here in the flesh, yet who would doubt that they watched most carefully and observed what he said to all, lest coming suddenly he might find them unprepared? Letter , To Hesychius
