Passage
And for this reason God sends upon them a deluding influence so that they will believe what is false,
And for this reason God sends upon them a deluding influence so that they will believe what is false,
2 Thessalonians 2:9 whose coming is in accord with the working of Satan, with all power and signs and false wonders,
2 Thessalonians 2:10 and with all the deception of unrighteousness for those who perish, because they did not receive the love of the truth so as to be saved.
2 Thessalonians 2:11 And for this reason God sends upon them a deluding influence so that they will believe what is false,
2 Thessalonians 2:12 in order that they all may be judged who did not believe the truth, but took pleasure in unrighteousness.
2 Thessalonians 2:13 But we should always give thanks to God for you, brothers beloved by the Lord, because God has chosen you as the first fruits for salvation through sanctification by the Spirit and faith in the truth.
The verse centers on "reason", "sends", "upon", "deluding", "influence", "believe", and "false". It is saying that the verse draws attention to "reason" and "sends", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 10's "and with all the deception of unrighteousness..." into verse 12's "in order that they all may be...", so "reason" and "sends" belong inside that flow. In 2 Thessalonians context, the local focus is Christ, faith, and discipleship.
A plain takeaway is to answer the verse's own emphasis on "reason" and "sends" with trust shaped by these words, not by a vague optimism outside the passage.