Paul (1Co 3:19) quoted this clause with the formula establishing its inspiration, “it is written.” He cites the exact Hebrew words, not as he usually does the Septuagint, Greek version (Psa 9:15). Haman was hanged on the gallows he prepared for Mordecai (Est 5:14; Est 7:10).
the wise - that is, “the cunning.”
is carried headlong - Their scheme is precipitated before it is ripe.