medieval-religion: Scholarly discussions of medieval religion and culture

Colleagues --

I am having trouble finding the first use of the phrase _ex opere
operato_.  Over and over I read that Peter of Poitiers invented the term in
the early twelfth century, but none of my sources provide a reference to
the specific place where he does so.  Can anyone help?

Thanks in advance.

Ayse Tuzlak
Religious Studies
University of Calgary

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