The sense of this passage clarifies when we fit it into a sub-theme present throughout the book: “Vanity of vanities, all is vanity.” As chapter 7 opens, Solomon presents several unusual and mystifying statements about some of life's experiences. He writes that the day of one's death is better than the day of one's birth and that it is better to go to the house of mourning than to the house of feasting.
These unusual statements are true within Solomon's theme, but reasons are not immediately available. Verse 15 and his ensuing explanation contain a parallel situation for which no easy answer exists. It, too, may be simply so much vanity. Throughout Ecclesiastes, Solomon is explaining matters that we vaguely grasp but need support to understand more completely.
Ultimately, God is the Author of Ecclesiastes, and He intends it should be understood this way. Supported by our faith in God, we must deal with our lack of complete knowledge and accept it. Some truths that God intends us to grasp we must dig out, requiring hard intellectual labor. He allows this sub-theme of not fully knowing what is going on in our lives to exist because it helps to create tests to fulfill His purpose, that we live by faith, trusting Him (Hebrews 10:38).
Ecclesiastes 3:10-11 confirms this sub-theme:
I have seen the God-given task with which the sons of men are to be occupied. He has made everything beautiful in its time. Also He has put eternity in their hearts, except that no one can find out the work that God does from beginning to end.
Solomon repeats a form of it in Ecclesiastes 7:23-25, 29:
All this I have proved by wisdom. I said, “I will be wise.” But it was far from me. As for that which is far off and exceedingly deep, who can find it out? I applied my heart to know, to search and seek out wisdom and the reason of things, to know the wickedness of folly, even of foolishness and madness. Truly, this only I have found; that God made man upright, but they have sought out many schemes.
He is still searching for reasons for these confounding circumstances, but he admits a dissatisfying failure. In Ecclesiastes 8:16-17, he still has no personally satisfying answer to his search:
When I applied my heart to know wisdom and to see the business that is done on earth, even though one sees no sleep day or night, then I saw all the work of God, that a man cannot find out the work that is done under the sun. For though a man labors to discover it, yet he will not find it; moreover, though a wise man attempts to know it, he will not be able to find it.
In Ecclesiastes 12:13-14, he concludes the book:
Let us hear the conclusion of the whole matter: Fear God and keep His commandments, for this is the whole duty of man. For God will bring every work into judgment, including every secret thing, whether it is good or whether it is evil.
Solomon admits to finding no fully satisfying answer to every paradox, conundrum, or irregularity in the life of even the faithful person in his relationship with God. The conclusion? By faith and without disrupting our obedience to God, we must accept and live with some events of life. The wise know that God will work things out.
John W. Ritenbaugh
Ecclesiastes and Christian Living (Part Ten): Paradox