Note 553 — ELEGY TO THE MEMORY OF AN UNFORTUNATE LADY.
Reading edition
Wakefield mentions that the phrase "unknowing how to yield" is used by Dryden, Æneis, xi. 472, and that the entire couplet is almost identical with two passages in Pope's own translation of the Iliad. The first is at Book ix. 749. The second is at Book xxii. 447, and runs thus:
The furies that relentless breast have steeled And cursed thee with a heart that cannot yield.