How can I defend a celibate priesthood?

What can I use to help defend the idea of celibate, unmarried priests?

Recommended resources:

Celibacy and the Priesthood by Catholic Answers

Celibacy of the Clergy by Catholic Encyclopedia

Apostolic Origins of Priestly Celibacy by Fr. Christian Cochini, S.J.

Celibacy and the Priesthood (audiotapes) by Fr. Ray Ryland and Patrick Madrid

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