And for this cause God shall send them strong delusion, that they should believe a lie:
For this cause - because "they received not the love of the truth;" the only safeguard against error.
Shall send, х pempei (G3992), 'sends'] - 'is sending' the "delusion" already. Those who reject the truth, God gives up in righteous judgment to Satan's delusions (Isaiah 6:9-10; Rom. 1:24-26:28). They first cast off "the love of tim truth," then given up by God, they settle down into 'believing the lie:' an awful climax (1 Kings 22:22-23; Job 12:16; Ezekiel 14:9; Matthew 24:5; Matthew 24:11; 1 Timothy 4:1).
Strong delusion, х energeian (G1753) planees (G4106)] - 'an effectual (energizing) working of error' answering to the energizing "working of Satan" (2 Thessalonians 2:9), contrasted with the Holy Spirit's 'effectual (energizing) working' in believers (Ephesians 1:19).
Believe a lie - Greek, 'the lie' which Antichrist tells, appealing to his miracles as proofs (2 Thessalonians 2:9).