Teaching Torah to a Priest

There is an interesting letter in R. Joseph B. Soloveitchik's Community, Covenant and Commitment: Selected Letters and Communications, that was sent to a priest in Boston to explain the Jewish view of the mitzvah of pidyon ha-ben (redeeming the firstborn). The editor prefaced the letter with the following:

While the Rav vigorously rejected any interfaith dialogue on religious matters, he was not averse to explaining the Jewish point of view on various topics to those who requested information and insight.

The letter is so long that it covers 10 pages of the book!