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, Job 10:22; 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).