1 sn The expression handed over to Satan refers to an act of discipline mentioned by Paul here and in 1 Cor 5:5, with a remedial goal, not a punitive one. The Greek word translated taught in this verse is used of “discipline, training of children” to lead them to correct behavior.
2 sn Revealing God’s purpose at his appointed time is a difficult expression without clear connection to the preceding, literally “a testimony at the proper time.” This may allude to testimony about Christ’s atoning work given by Paul and others (as v. 7 mentions). But it seems more likely to identify Christ’s death itself as a testimony to God’s gracious character (as vv. 3-4 describe). This testimony was planned from all eternity, but now has come to light at the time God intended, in the work of Christ. See 2 Tim 1:9-10; Titus 2:11-14; 3:4-7 for similar ideas.