ISB ~ 2 Thessalonians 2 v3

the rebellion:Or, “the apostasy”. Paul envisions a time of terrible confusion and massive falling away from God at the end of days (1 Tim 4:1-2; 2 Tim 3:1-5).

the man of lawlessness:A man of extraordinary evil. When he comes, he will deify himself, claiming to be God (2:4); he will dazzle the wicked with displays of his power (2:9); and he will deceive the world with falsehoods of every kind (2:10). Most identify this figure with “the antichrist” prophesied by John (1 Jn 2:18, 22; 4:3; 2 Jn 1:7) (CCC 675-77).

son of perdition:A Semitic way of saying “one who is doomed to destruction”. Jesus gave this title to his betrayer, Judas Iscariot (Jn 17:12).