1 Thessalonians 5:6

Therefore let us not sleep as do others
&c.] As the rest of the Gentiles, as unconverted persons, who are in a state of darkness, and are children of the night; let us not act that part they do, or be like them; which professors of religion too much are, when they indulge themselves in carnal lusts and pleasures, and are careless and thoughtless about the coming of the day of the Lord; and get into a stupid, drowsy, and slumbering frame of spirit; when grace lies dormant as if it was not, and they grow backward to, and slothful in the discharge of duty, and content themselves with the bare externals of religion; and become lukewarm and indifferent with respect to the truths and ordinance of the Gospel, the cause of God, the interest of religion, and glory of Christ; and are unconcerned about sins of omission or commission: and are willing to continue in such a position, being displeased at every admonition and exhortation given them to awake; but this is very unbecoming children of the light, and of the day:

but let us watch;
over ourselves, our hearts, thoughts, affections, words and actions; and over others, our fellow Christians, that they give not into bad principles and evil practices; and against sin, and all appearance of it; against the temptations of Satan, the snares of the world, and the errors of wicked men, who lie in wait to deceive; and in the word and ordinances, and particularly in prayer, both unto it, in it, and after it; and for the second coming of Christ, with faith, affection, and patience; and the rather, because of the uncertainty of the time of it;

and be sober;
not only in body, abstaining from excessive eating and drinking, using this world, and the good things of it, so as not to abuse them, or ourselves with them; but also in mind, that the heart be overcharged with the cares of this world; for men may be inebriated with the world, as well as with wine; and the one is as prejudicial to the soul as the other is to the body; for an immoderate care for, and pursuit after the world, chokes the word, makes it unfruitful, and runs persons into divers snares and temptations, and hurtful lusts. The Arabic version renders it, "let us repent"; and the Ethiopic version, "let us understand"; as intending the sobriety of the mind, repentance being an after thought of the mind, a serious reflection on past actions with sorrow and concern; and thinking soberly, and not more highly than a man ought to think of himself, his gifts, his attainments and abilities, in opposition to pride, vanity, and self-conceit, is very becoming; and shows a true and well informed understanding and judgment, and that a man is really sober and himself.