The third of the Epistles is Paul's second letter to the Christians in Corinth, or II Corinthians. Some members of the Church in Corinth had challenged Paul's authority over them and so he had sent two of his followers, Titus and Timothy, ahead before setting off himself to Corinth. Titus returned from Corinth and reported to Paul that the Christians there had repented of their challenge to Paul's teaching. This heartened Paul, but there were still some issues which need dealing with, and so he wrote this second letter.
"For ye suffer fools gladly, seeing ye yourselves are wise"
This line from II Corinthians has changed slightly into "he does not suffer fools gladly" in the modern phrase used to describe someone who gets angry at people he thinks are stupid