then I saw all that God has done. No one can comprehend what goes on under the sun. Despite all their efforts to search it out, no one can discover.

17 then I saw everything that God has done. No one is able to grasp the work that is done under the sun. However hard a person may search for it, he will not ...

And I saw all the work of God, that no man shall be able to find out the work that was done under the sun in whatsoever a man shall labor to seek out, and he ...

then I saw all the work of God, that man cannot find out the work that is done under the sun. However much man may toil in seeking, he will not find.

A man cannot find out the work that is done under the sun: because though a man labour to seek it out, yet he shall not find it.

A man cannot find out the work that is done under the sun: he can find out that it is done, but not the reason why it is done.

Solomon reinforces the truth that full understanding is beyond human grasp. We can see and enjoy the work of God, but we cannot fully comprehend it.

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.

Ecclesiastes 8:17 — The New Revised Standard Version (NRSV). 17 then I saw all the work of God, that no one can find out what is happening under the sun.