'Discover' in the Bible

He has made everything appropriate in its time. He has also put eternity in their hearts, but man cannot discover the work God has done from beginning to end.

In the day of prosperity be joyful, but in the day of adversity, consider: God has made the one as well as the other, so that man cannot discover anything that will come after him.

What exists is beyond reach and very deep. Who can discover it?

I observed all the work of God and concluded that man is unable to discover the work that is done under the sun. Even though a man labors hard to explore it, he cannot find it; even if the wise man claims to know it, he is unable to discover it.