In 2 Thessalonians 1.4, Paul speaks of the “patience and faith” of the Thessalonians. Nowhere was their growth in faith and love more evident than in the way they patiently and faithfully endured hostilities and suffering from the enemies of Christ. Although there was no need to speak, since the Thessalonians’ lives spoke clearly enough (1 Thess. 1.8), Paul’s joy before the Lord over their perseverance bubbled up.
Having a right attitude toward suffering (v. 5) is essential, and that required attitude is concern for the kingdom of God. They were not self-centered but concentrated on God’s kingdom. Their focus was not on personal comfort, fulfillment, and happiness, but on the glory of God and the fulfillment of His purposes. They were not moaning about the injustice of their persecutions. Rather, they were patiently enduring the sufferings they did not deserve (v. 4). This very attitude was “manifest evidence” or positive proof that God’s wise process of purging, purifying, and perfecting through suffering was working to make His beloved people worthy of the kingdom (2.12) by being perfected (James 1.2–4; 1 Pet. 5.10).
For believers, afflictions are to be expected (1 Thess. 3.3) as they live and develop Christian character in a satanic world. Suffering is not to be thought of as evidence that God has forsaken them, but as evidence that He is with them, perfecting them (Matt. 5.10; Rom. 8.18; 2 Cor. 12.10). So the Thessalonians demonstrated that their salvation, determined by faith alone in the Lord Jesus Christ, was genuine because they, like Christ, were willing to suffer on account of God and His kingdom. They suffered unjustly as objects of man’s wrath against Christ and His kingdom (Acts 5.41; Phil. 3.10; Col. 1.24).