The Lord made great recommendations to his disciples that their spirit should shake all that is earthly in nature like dust, and thus rise to the desire of supernatural realities; according to one of these recommendations, those who turn to life from above must be stronger than sleep and always keep their minds vigilant.
I speak of this slumber aroused by those who are buried in the lie of life by these illusory dreams of honor, riches, power, ostentation, the fascination of pleasures, ambition, the thirst for pleasure, vanity and all that the imagination leads superficial men to pursue madly. All these things flow with the ephemeral nature of time; they are in the domain of appearances; as soon as they appeared to exist, they disappear like waves on the sea.
It is so that our mind is free from these illusions that the Word invites us to shake our souls' eyes this deep sleep, so that we do not slip away from the real realities by attaching ourselves to what has no consistency. This is why he offers us vigilance, saying to us: "Keep your loins girded and your lamps burning." (Lk 12,35).
For the light, shining before the eyes, drives away the sleep, and the loins tight by the belt prevent the body from succumbing to it. He who is girded by temperance lives in the light of pure consciousness; filial trust illuminates his life like a lamp. If we live like this, we will enter a life similar to that of angels.
Saint Gregory of Nyssa (v. 335-395), monk and bishop - Homily 11 on the Song of Songs
"So let us be confident, let us not be unprepared, let us not be outflanked, let us be wise, vigilant, fighting against those who are trying to tear the faith out of our souls and morality out of our hearts, so that we may remain Catholics, remain united to the Blessed Virgin Mary, remain united to the Roman Catholic Church, remain faithful children of the Church."- Archbp. Lefebvre 1980