IMO

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Finally, we come to the Priest. He would be greeted simply as "Father," which reflects his spiritual fatherhood to those entrusted to his care by virtue of the Sacrament of Holy Orders. A letter to him would be addressed, "The Reverend William P. Saunders," for example, with the salutation, "Dear Father Saunders" or "Reverend and Dear Father Saunders." Some "Fathers" are also formally addressed "Very Reverend" when they have a special duty; for example, Father Frank Ready, the Dean of Deanery II, would be addressed, "The Very Reverend Frank Ready."
http://www.catholiceducation.org/en/culture/catholic-contrib...

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The Reverend is a style[1] most often used as a prefix to the names of Christian clergy and ministers.

Roman Catholic
Priests with various grades of jurisdiction above pastor (e.g., vicars general, judicial vicars, ecclesiastical judges, episcopal vicars, provincials of religious orders of priests, rectors or presidents of colleges and universities, priors of monasteries, deans, vicars forane, archpriests): The Very Reverend (in writing).

http://en.wikipedia.org/wiki/The_Reverend#Roman_Catholic
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Note added at 3 hrs (2015-04-20 22:25:35 GMT)
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The Conventual Franciscan Friars
As a young adult, Rev. Dr. Mathias was largely influenced by the Conventual Franciscan Friars, a Roman Catholic religious order that he joined at age 18.
http://www.jaymemathias.com/preaching.html