Pelagius

[Steven Avery]

review of Berriman
https://books.google.com/books?id=87UPAAAAQAAJ&pg=PA115

also this section is discussed here

Hilary of Poitiers and Hilary the Deacon

Hilary of Poiters https://en.wikipedia.org/wiki/Hilary_of_Poitiers Hilary of Poitiers (Latin: Hilarius; c. 310 – c. 367)[2] was Bishop of Poitiers and a Doctor of the Church. He was sometimes referred to as the "Hammer of the Arians" (Malleus Arianorum) and the "Athanasius of the West",[3] His...

www.purebibleforum.com

Samuel Davidson on Pelagius (not the verse)
http://books.google.com/books?id=3VgXAAAAYAAJ&pg=PA360

 

[Brianrw]

It is reported that Pelagius quotes the passage with sacramentum. That is, Magnum est pietatis sacramentum quod manifestatum est in carne. I have been unable to find the reference.