Augustine of Hippo

The apostles were not therefore found to disagree in anything. Otherwise, when Paul claimed to have received the gospel perfectly, they might have denied this and wished to add to his teaching, as though he were incomplete. On the contrary, instead of reproving Paul's imperfection, they approved his perfection.… His saying "on the contrary" might also be understood in such a way as to yield the following meaning: "Upon me those who had a reputation imposed nothing further. On the contrary, they consented with me and Barnabas, joining the right hand of fellowship, that we, for our part, should go among the Gentiles, who are contrary to the circumcision, while they for their part should go to those of the circumcision."