Socrates of Constantinople
Verse 33 contains a quotation from classical Greek literature. According to the church historian Socrates of Constantinople it is taken from a Greek tragedy of Euripides, but modern scholarship, following Jerome attributes it to the comedy "Thaĩs" by Menander, or Menander quoting Euripides. It might not have been a direct quote by Paul: "This saying was widely known as a familiar quotation."