Why read commentaries? Lots of reasons. But one reason is for gems such as this, mined from Craig Blomberg’s 1 Corinthians (Zondervan, 1994) in the NIV Application Commentary:
Commenting on 1 Corinthians 1:8-9, Blomberg writes,
“How can Paul be so thankful and positive [vv. 4-9] about a church rife with divisions and abuses [as the church at Corinth clearly was]…? Verses 8-9 supply the answer: God’s character provides the guarantee. He will remain faithful to his promises ultimately to perfect his people, however immature they at times seem to be (vv. 8a, 9). When he returns, when the age of the fulfillment of all the remaining biblical promises arrives, then believers will be made wholly blameless (v. 8b). Acquitted of their past sins, they will be fully prepared for the life to come. Even now, his people are in the process of being remolded, even if it is with fits and starts…” (p. 37).