For if someone comes [to you] proclaiming another "Jesus," whom we [apostles] had not preached, or if you people receive a different "spirit" from the one you have [already] received, or a different "gospel" from the one you have [already] accepted, you put up with him quite well.

And we have sent [i.e., are sending] with them our brother [Note: This is a different person from the one mentioned in verse 18], who has often proven his diligence to us in many ways, and is now proving to be even more diligent because of the great confidence he has in you [i.e., confidence in the Corinthians completing their collection for the poor].