Ecclesiastes 11:8

“But if a man live many years, etc.] Enjoying light and life, and beholding the sun with much delight and pleasure. The days of men on earth, or under the sun, are but few at most; but some live many days, in comparison of others; they come to a good old age, as Abraham did; and to their graves like a shock of corn fully ripe; and arrive to, or beyond, the common term of human life; [and] rejoice in them all; in and throughout the many years he lives, even all his days; that is, is blessed with a plentiful portion of the good things of life, and enjoys them in a free and comfortable manner, with moderation and thankfulness; partakes of the good of his labour, and rejoices in his works, in the…”

“But while man thankfully enjoys life, "let him remember" it will not last for ever. The "many days of darkness," that is, the unseen world (Job 10:21-22; Psa 88:12), also days of "evil" in this world (Ecc 11:2), are coming; therefore sow the good seed while life and good days last, which are not too long for accomplishing life's duties. All that cometh--that is, All that followeth in the evil and dark days is vain, as far as work for God is concerned (Ecc 9:10).”

“The preceding exhortation to a life of labor in the sight of God is now addressed especially to the active and the young; and is enforced by another consideration, namely, the transitory character of all that sustains youth. Ecclesiastes 11:7 The light ... the sun - Gifts of God which cheer man’s toil, but which he almost ceases to appreciate in his old age. Ecclesiastes 11:8 Days of darkness - The time of old age, and perhaps any time of sorrow or misfortune. Compare Ecclesiastes 12:2. All that cometh - i. e., “The future,” which must not be reckoned on by the active man, as if his present state of healthy energy were to continue. Ecclesiastes 11:9 Rejoice ... cheer ... walk - The…”

“Rejoice - Enjoy all the comforts, and escape all the embitterments of human life, all his days. Darkness - Of death, or of the state of the dead. Many - Far more than the days of this short life. All - All things which befall any man belonging only to this life, are but vain, because they are short and transitory. Ecclesiastes 11:9”

“if a man, Ecc 6:6, Ecc 8:12 rejoice: Ecc 3:12, Ecc 3:13, Ecc 5:18-20, Ecc 8:15 yet: Ecc 7:14, Ecc 12:1-5; Deu 32:29; Job 10:22, Job 14:10, Job 15:23, Job 18:18; Jer 13:16; Joe 2:2; Mat 22:13; Joh 12:35; Jde 1:18 All that: Ecc 2:1-11, Ecc 2:15, Ecc 2:17, Ecc 2:19, Ecc 2:21-23, Ecc 2:26, Ecc 4:8, Ecc 4:16, Ecc 5:15, Ecc 5:16, Ecc 6:11 Ecclesiastes 11:9”