When Don Quixote saw it, rendered in such lifelike style that one would have said Christ was speaking and Paul answering, "This," he said, "was in his time the greatest enemy that the Church of God our Lord had, and the greatest champion it will ever have; a knight-errant in life, a steadfast saint in death, an untiring labourer in the Lord’s vineyard, a teacher of the Gentiles, whose school was heaven, and whose instructor and master was Jesus Christ himself."
There are no more uses of "gentile" in the book.
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Jews often suffered discrimination in gentile institutions in those days.
The Bible records Jesus instructing his twelve apostles to teach the Jews and Paul to teach the gentiles.