Be sober, be vigilant,.... The apostle had exhorted to each of these before; see 1Pe 1:13 but thought fit to repeat them; sobriety and watchfulness being exceeding necessary and useful in the Christian life; and the one cannot well be without the other: unless a man is sober in body and mind, he will not be watchful, either over himself or others, or against the snares of sin, Satan, and the world; and if he is not on his watch and guard, he is liable to every sin and temptation.
The Syriac version renders the words, "watch", and "be ye mindful", or "remember"; watch with diligence, care, and industry, keeping a good lookout, minding and observing everything that presents, and remembering the power and cunning of the enemy; and the Ethiopic version renders them thus, "be ye prudent, and cause your heart to understand"; referring them not to temperance of body, but sobriety of mind, and to a prudent conduct and behaviour, as having a subtle as well as a malicious enemy to deal with:because your adversary the devil; he who is a defamer and calumniator; who accuses God to men, and men to God, and is therefore styled the accuser of the brethren; he is the saints' avowed and implacable enemy.
Satan is an enemy to mankind in general, but more especially to the seed of the woman, to Christ personal, and to Christ mystical, to all the elect of God: the word here used is a forensic term, and signifies a court adversary, or one that litigates a point in law, or opposes another in an action or suit at law.
The Jews have adopted this word into their language, and explain it by Nyd leb, "a law adversary", or one that has a suit of law depending against another.