who knoweth: Ecclesiastes 2:3, Ecclesiastes 12:13; Psalms 4:6, Psalms 16:5, Psalms 17:15, Psalms 47:4; Lamentations 3:24-27; Micah 6:8
the days of his vain life: Heb. the number of the days of the life of his vanity, Ecclesiastes 8:13, Ecclesiastes 9:6; 1 Chronicles 29:15; Job 8:9, Job 14:2; Psalms 39:5-6, Psalms 89:47, Psalms 90:10-12; Psalms 102:11, Psalms 109:23, Psalms 144:4; James 4:14
for who can: Ecclesiastes 3:22, Ecclesiastes 8:7; Job 14:21