standing afar off - as unworthy to draw near; but that was the way to get near (Psa 34:18; Isa 57:15).
would not lift up - blushing and ashamed to do so (Ezr 9:6).
smote, etc. - kept smiting; for anguish (Luk 23:48), and self-reproach (Jer 31:19).
be merciful - “be propitiated,” a very unusual word in such a sense, only once else used in the New Testament, in the sense of “making reconciliation” by sacrifice (Heb 2:17). There may therefore, be some allusion to this here, though not likely.
a sinner - literally, “the sinner”; that is, “If ever there was one, I am he.”