What advantage does man have in all his work
Which he does under the sun?

So I hated life, for the work which had been done under the sun was grievous to me; because everything is futility and striving after wind.

He has made everything appropriate in its time. He has also set eternity in their heart, yet so that man will not find out the work which God has done from the beginning even to the end.

Do not let your speech cause you to sin and do not say in the presence of the messenger of God that it was a mistake. Why should God be angry on account of your voice and destroy the work of your hands?

Consider the work of God,
For who is able to straighten what He has bent?

and I saw every work of God, I concluded that man cannot discover the work which has been done under the sun. Even though man should seek laboriously, he will not discover; and though the wise man should say, “I know,” he cannot discover.