1 Thessalonians 3:5—“For this cause, when I could no longer forbear, I sent to know your faith, lest by some means the tempter have tempted you, and our labour be in vain.”

Paul’s pastoral concern for the Thessalonian believers was intense. He knew that they were enduring persecution, and he also knew that Satan would seek to use those trials to weaken their faith. Unable to bear the uncertainty any longer, Paul sent Timothy “to know” their spiritual condition.

Here Satan is called “the tempter”. His work is to entice believers away from steadfast trust in God. He may use fear, suffering, discouragement, false teaching, or worldly attraction to unsettle the soul. Paul did not underestimate this danger. Though the Thessalonians had sincerely received the Gospel, they still needed watchfulness and strengthening.

Paul feared that “our labour be in vain”. He did not mean that God’s saving purpose could finally fail. Rather, he feared that the fruit of his ministry among them might be seriously damaged if they yielded to temptation and abandoned their profession of faith. Gospel labour seeks not merely initial response but enduring faithfulness.

This verse reminds us that spiritual danger is real. A good beginning in the Christian life must be followed by perseverance. We must therefore watch over our hearts, resist the devil, remain in God’s Word, pray continually, and seek the fellowship of faithful believers.

Pastors and Christian friends must also care about one another’s spiritual condition. Paul did not merely ask whether the Thessalonians were comfortable; he wanted to know about their faith. Likewise, our greatest concern for one another should be that, amid every trial and temptation, we continue steadfastly believing, obeying, and following Christ.