Exhausted from battle, Sisera catnapped beneath a rug, believing he was safe from danger—and he awoke with a tent peg lodged in his head (Jud. 4:17-21). Samson slept in Delilah’s arms without a care in the world, and she shaved his locks, sapping him of strength (Jud. 16:19). David swiped Saul’s spear while he obliviously slumbered on the ground (1 Sam. 26:12). When there is danger afoot, you cannot afford to carelessly fall asleep—you might wake up hairless, weaponless, or even dead. That is why Paul the apostle admonished all Christians to, “Be on the alert” (1 Cor. 16:13a, NASB).

Believers must be wide-awake, wary, and watchful for spiritual danger. Disciples of the Lord must keep their eyes peeled for spiritual danger lest they become blindsided. Soldiers in Christ’s army must keep their ears to the ground for spiritual threats so that they don’t end up on the ground in defeat. Saints must stay on their toes so that their feet will not slip into temptation. Victory in spiritual warfare requires vigilance, but sleeping on the job results in vulnerability and being vanquished.

And the threats believers should watch out for are the Tempter and temptation. Peter exhorted believers in 1 Peter 5:8, “Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion, seeking someone to devour.” If you are a believer, you must stay sharp because Satan is always stalking you. Similarly, Jesus commanded Christians: “Watch and pray that you may not enter into temptation. The spirit indeed is willing, but the flesh is weak” (Matt. 26:41). As a believer, your only defense against temptation is keeping your eyes peeled for the things which seduce you, and keeping your eyes on the Lord in prayer.

The Scripture tells us that the threats presented by Satan and posed by our own flesh are so cunning and crafty that we must watch for spiritual danger even while we pray. As Paul said in Colossians 4:2, “Continue steadfastly in prayer, being watchful in it with thanksgiving.” Thus, like a soldier during the night-watch, we must stay awake and remain aware of Satan’s illusions and inducements, and our own fleshly inclinations to wander into wickedness. We must watch our surroundings and watch our souls. We must look around for the devil’s deceptions and look within, diligently watching our hearts which are prone to many seductions and lusts.

It is when we get caught napping that we fall into trouble. The great Puritan, William Gurnall, who wrote an impressive volume on spiritual warfare, said as much when he warned,

“The saint’s sleeping time is Satan’s tempting time; every fly dares venture to creep on a sleeping lion. Thus, the Christian asleep in security may soon be surprised so as to lose much of his spiritual strength.”

Sin and Satan never sleep, so neither can we.

Pick up a copy of Brandon’s latest book, Fundamentals for the Faithful, which explains the importance of all the basics which every believer should know: