2 Thessalonians 2:11-13

Because of this God will send upon them a misleading influence, [an activity of error and deception] so they will believe the lie, in order that all may be judged and condemned who did not believe the truth [about their sin, and the need for salvation through Christ], but instead took pleasure in unrighteousness. But we should and are [morally] obligated [as debtors] always to give thanks to God for you, believers beloved by the Lord, because God has chosen you from the beginning for salvation through the sanctifying work of the Spirit [that sets you apart for God’s purpose] and by your faith in the truth [of God’s word that leads you to spiritual maturity].