We here excludes the readers.

Weak and strong here mean that Paul is happy to be wrong or to suffer defeat as long as the Corinthians are living victorious Christian lives. Indeed, Paul prays that they will continue to grow more mature in their Christian living. It should be noted that this verse uses the same vocabulary as in 10.10, where the theme of strength and weakness was introduced. This, then, is the conclusion of the matter.

Your improvement: this wording, as well as the Good News Translation rendering “that you will become perfect,” may be misleading. The idea here is not so much that of bringing to perfection something that is already good. It is rather one of restoring something that has been damaged or reinstating something that was lost. Paul used the verb form of this noun in Gal 6.1 to speak of the need to restore a fellow Christian who had sinned. Hence Anchor Bible, Barrett, and Martin translate “your restoration,” while Revised English Bible speaks of “your amendment.”

Quoted with permission from Omanson, Roger L. and Ellingworth, Paul. A Handbook on Paul’s Second Letter to the Corinthians. (UBS Handbook Series). New York: UBS, 1993. For this and other handbooks for translators see here .