Commentaries:
Jamieson, Fausset, and Brown
know that they shall die—and may thereby be led "so to number their days, that they may apply their hearts to wisdom" (Ecclesiastes 7:1-4; Psalms 90:12).
dead know not anything—that is, so far as their bodily senses and worldly affairs are concerned (Job 14:21; Isaiah 63:16); also, they know no door of repentance open to them, such as is to all on earth.
neither . . . reward—no advantage from their worldly labors (Ecclesiastes 2:18-22; Ecclesiastes 4:9).
memory—not of the righteous (Psalms 112:6; Malachi 3:16), but the wicked, who with all the pains to perpetuate their names (Psalms 49:11) are soon "forgotten" (Ecclesiastes 8:10).
Other Jamieson, Fausset, and Brown entries containing Ecclesiastes 9:5:
Job 14:21
Ecclesiastes 1:11
Ecclesiastes 9:2
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