At the same time, the Apostle again presents Christians' dwelling in the light, or in sonship to the light, and their opposition to people of darkness who sleep and become drunk.
He presents this as something favorable to the triumph of the good, which can readily appear in the light, just as evil appears in darkness.
The Savior Himself commanded us to watch, saying: "Watch at all times, praying that you may be counted worthy to escape all these things that will come to pass, and to stand before the Son of Man" (Lk 21:3-33).
The Apostles taught the same (1 Pet 5:8; 1 Cor 16:13).
According to St. John Chrysostom's explanation, "Here the Apostle shows that remaining in the daylight depends on us. In the ordinary day and night this does not depend on us.
But with that night and that sleep it is not so. One can watch without ceasing. One can remain constantly amid the day.
To close the spiritual eyes and surrender to sinful sleep is not a matter of nature, but of free choice. For even one who watches may sleep if he does not do good.
Therefore he added: let us be sober. Sobriety is the intensification of watchfulness." Sobriety, says His Grace Theophan, is the heart's detachment from attachments and passions.
Watchfulness is the tension of the active powers. The reminder about vigilance and attention brought military guard duty to mind, and guard duty brought armor to mind.
Faith with love guards the whole constitution of the soul, not allowing wrong thoughts and movements of the heart. Hope guards the head of life, that is, energy.
This energy immediately falls as soon as despair steals into the soul. Faith, love, and hope, the chief functions of the Christian life, are also the very weapons for repelling hostile attacks (cf. 1 Cor 13:13; 2 Cor 10:4; Rom 6:13; Eph 6:11).