How do we know that we are counted worthy of the kingdom of God?

According to 2 Thessalonians 1:5, being counted worthy of the kingdom of God is closely tied to enduring suffering and maintaining faith in Christ. The church in Thessalonica was commended for their patience and faith amid persecutions. Their trials served as evidence of God's righteous judgment, affirming their status as members of His kingdom. It is through faith—a belief that Christ's righteousness alone makes one worthy—that believers continue to persevere. This endurance in faith during suffering ultimately serves as a token of divine grace, ensuring their calling and election in Him, as referenced in 1 Peter 1:6-7.