2 Corinthians 10:14

For we stretch not ourselves overmuch, as though we reached not unto you: for we came even as far as unto you in the gospel of Christ.

Paul here stated that his authority was fully ample to reach Corinth without, in any sense, "stretching" it! The perspective of the false teachers was local; Paul's was universal. Paul had come to Corinth in the first place, not as a final destination, but as a stop en route on a preaching tour of vast dimensions.

Filson very properly applied this passage to the false teachers as follows:

The self-important intruders, when they came to Corinth, were going where they had not been sent by God. But not so with Paul. He went to Corinth under the guidance and direction of God. Corinth was included ("you also") in his assigned field of work.[15]