2 Thessalonians 2:3
A falling away -- apostasy, NASV; rebellion, NIV. Hebrews 3:12. cf. Hebrews 12:25, [Could this be referring to the falling away of many Jewish Christians who turned back to Judaism during the AD 60’s.]
Falling away -- A common term for "military rebellion", rebellion or munity against God. [It could even refer to the Jewish rebellion against Roman authority.]
Man of sin -- = son of perdition, v.8 Wicked one; describes an attribute of the person under consideration; ie. Jesus is called "the man of sorrows" Isaiah 53:3, 1 Peter 2:19.
Man of sin -- see the Excursion on the Man of Sin in the Pulpit Commentary.
Son of perdition -- Termed used by Jesus to describe Judas John 17:12. "Son of .." also described a dominate characteristic of the person, etc. "son of consolation" Acts 4:36.
Son of perdition -- The Jewish mind often spoke metaphorically of a "characteristic" dwelling in a person, and sometimes calling him the "son of ... " that characteristic. Thus, of Barnabas as "son of consolation" Acts 4:36, and James and John as "sons of thunder" Mark 3:27; and the term "son of perdition" in 2 Thessalonians 2:3.
See ISBE "Son; Sons" (3)
(3) The word “son” is used with a following genitive of quality to indicate some characteristic of the person or persons described. In the English the word “son” is usually omitted and the phrase is paraphrased as in 2 Samuel 3:34, where the words translated “wicked men” in the King James Version mean literally, sons or children of wickedness.
Man of Sin .... IDENTITY
1. Jewish high priest, or Jewish hierarchy, etc. Jewish priests opposed idols and Jesus. The High Priest took Jesus’ job of making atonement for sin.
The "restrainer" in this scenario would be the Roman government which prevented them from an outright slaughtering of Christians. The "apostasy" would be those Jewish Christians turning back to Judaism.
2. NERO - Became the worse Roman Emperor persecuting Christians. He had been restrained by Seneca from his evil ways, until he had Seneca put to death. He then followed his evil heart. (Pulpit Commentary, 2Thess.2.3 p.56, "Nero was already adopted by Claudius, and was regarded by many as the future Caesar. ’He that restraineth’ was Claudius." )
(Philip Shaff’s History of the Christian Church) Vol 1, ch. 6
Nero
The first of these imperial persecutions with which the Martyrdom of Peter and Paul is connected by ecclesiastical tradition, took place in the tenth year of Nero’s reign, a.d. 64, and by the instigation of that very emperor to whom Paul, as a Roman citizen, had appealed from the Jewish tribunal. It was, however, not a strictly religious persecution, like those under the later emperors; it originated in a public calamity which was wantonly charged upon the innocent Christians.
A greater contrast can hardly be imagined than that between Paul, one of the purest and noblest of men, and Nero, one of the basest and vilest of tyrants. The glorious first five years of Nero’s reign (54-59) under the wise guidance of Seneca and Burrhus, make the other nine (59-68) only more hideous by contrast. [emphasis WG] We read his life with mingled feelings of contempt for his folly, and horror of his wickedness. The world was to him a comedy and a tragedy, in which he was to be the chief actor. He had an insane passion for popular applause; he played on the lyre; he sung his odes at supper; he drove his chariots in the circus; he appeared as a mimic on the stage, and compelled men of the highest rank to represent in dramas or in tableaux the obscenest of the Greek myths. But the comedian was surpassed by the tragedian. He heaped crime upon crime until he became a proverbial monster of iniquity. The murder of his brother (Britannicus), his mother (Agrippina), his wives (Octavia and Poppaea), his teacher (Seneca), and many eminent Romans, was fitly followed by his suicide in the thirty-second year of his age. With him the family of Julius Caesar ignominiously perished, and the empire became the prize of successful soldiers and adventurers.
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The "restrainer" could be Claudius, OR as some think, Seneca who was an influence for good and restrains upon Nero until Nero murdered him.
3. After the reformation movement, many began to think this was a reference to pope.
4. Some have interpreted it as Muhammad and Islam.
5. Some historical person, well known and understood by Paul’s readers, but we don’t know who it was. His name or identity is not revealed outright, but spoken of in veiled terms, probably to protect the Christians from additional persecution.