Contradiction with Matthew 28:19
2 Corinthians 10:14 implies Paul is reaching out to areas beyond the Corinthians, but Matthew 28:19 encourages reaching all nations, which might suggest Paul's limits are broader.
Matthew 28:19: Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: [teach...: or, make disciples, or, Christians of all nations]
Contradiction with Acts 1:8
While 2 Corinthians 10:14 indicates limits in spreading the Gospel, Acts 1:8 mandates disciples to be witnesses to the ends of the earth, suggesting no geographical limits.
Acts 1:8: But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth. [power...: or, the power of the Holy Ghost coming upon you]
Contradiction with Romans 15:20
Paul, in 2 Corinthians 10:14, discusses boundaries for his ministry, but Romans 15:20 expresses his ambition to preach where Christ was not known, implying a lack of geographical restriction.
Romans 15:20: Yea, so have I strived to preach the gospel, not where Christ was named, lest I should build upon another man's foundation:
Contradiction with Mark 16:15
2 Corinthians 10:14 suggests Paul's work reaches but does not exceed certain areas, whereas Mark 16:15 commands preaching to every creature everywhere.
Mark 16:15: And he said unto them, Go ye into all the world, and preach the gospel to every creature.
Contradiction with Colossians 1:23
Suggests the Gospel is preached to every creature under heaven, whereas 2 Corinthians 10:14 implies Paul's work has specific boundaries.
Colossians 1:23: If ye continue in the faith grounded and settled, and [be] not moved away from the hope of the gospel, which ye have heard, [and] which was preached to every creature which is under heaven; whereof I Paul am made a minister;