An Unidentified Latin Quote in Piers Plowman.
“Quandocumque ingemuerit peccator, onmes iniquitates eius non recordabor amplius,” found at (Skeat) C.8.148, derives not from Jer. 31:34, but from Pseudo-Ezekiel 33:12, where it is found verbatim. This extremely popular verse, the second most common quotation in the scholastic debate on penitence, is the locus classicus for the argument that no sin is too great to be forgiven if the sinner but repent; it is often applied to Mary Magdalen, who forms the immediate context of WL’s citation.
MP 88 (1991): 398-400.
Marchand, James W.