They are dead, they shall not live; they are deceased, they shall not rise: therefore hast thou visited and destroyed them, and made all their memory to perish.
(They are) dead - the "other lords," or tyrants (Isaiah 26:13).
They shall not live - namely, again.
(They are) deceased - Hebrew, Rephaim, the wicked dead: giants once in might and in crime, now in Hades (Psalms 88:11; Job 26:5; Proverbs 2:18; Proverbs 9:18); powerless in the land of shades (note, Isaiah 14:9-10).
Therefore - i:e., inasmuch as Compare the like use of "therefore," Genesis 18:5; Genesis 19:8.