Merciful (ιλεως). Old Attic adjective for ιλαος, common in the LXX, only here in N.T., from which ιλασκομα comes (Luke 18:13).

Will I remember no more (ου μη μνησθω ετ). Double negative ου μη with first aorist passive subjunctive (volitive) of μιμνησκω, to recall.