1 Thessalonians 5:6

But he who has the light watches, “and darkness seizes not on him,” nor sleep, since darkness does not. He that is illuminated is therefore awake towards God; and such an one lives. “For what was made in Him was life.” “Blessed is the man,” says Wisdom, “who shall hear me, and the man who shall keep my ways, watching at my doors, daily observing the posts of my entrances.” “Let us not then sleep, as do others, but let us watch,” says the Scripture, “and be sober. For they that sleep, sleep in the night; and they that be drunken, are drunken in the night,” that is, in the darkness of ignorance. “But let us who are of the day be sober. …

But the variety of disposition arises from inordinate affection to material things. And for this reason, as they appear to me, to have called night Euphrone; since then the soul, released from the perceptions of sense, turns in on itself, and has a truer hold of intelligence ( φρόνησις ). Wherefore the mysteries are for the most part celebrated by night, indicating the withdrawal of the soul from the body, which takes place by night. “Let us not then sleep, as do others; but let us watch and be sober. For they that sleep, sleep in the night; and they that are drunken, are drunken in the night. But let us who are of the day be sober, putting on the breastplate of faith and love, and as an helmet the hope of salvation.” And as to what, again, they say of sleep, the very same things are to be understood of death. …

15. What has been said relates to the words of the apostle, that “we see now through a glass;” but whereas he has added, “in an enigma,” the meaning of this addition is unknown to any who are unacquainted with the books that contain the doctrine of those modes of speech, which the Greeks call Tropes, which Greek word we also use in Latin. For as we more commonly speak of schemata than of figures, so we more commonly speak of tropes than of modes. And it is a very difficult and uncommon thing to express the names of the several modes or tropes in Latin, so as to refer its appropriate name to each. And hence some Latin translators, through unwillingness to employ a Greek word, where the apostle says, “Which things are an allegory,” have rendered it by a circumlocution, Which things signify one thing by another. …

Ver. 6, 7, 8 . “So then let us not sleep, as do also the rest, but let us watch and be sober. For they that sleep sleep in the night; and they that be drunken are drunken in the night. But let us, since we are of the day, be sober.” Here he shows, that to be in the day depends on ourselves. For here indeed, in the case of the present day and night, it does not depend on ourselves. But night comes even against our will, and sleep overtakes us when we do not wish it. But with respect to that night and that sleep, it is not so, but it is in our power always to have it day, it is in our power always to watch. For to shut the eyes of the soul, and to bring on the sleep of wickedness, is not of nature, but of our own choice. “But let us watch,” he says, “and be sober.” For it is possible to sleep while awake, by doing nothing good. …