Ecclesiastes 1:13

“And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail...”

Ecclesiastes 2:23

“For all his days are sorrows, and his travail grief; yea, his heart taketh not rest in the night. This is also vanity.”

Ecclesiastes 2:26

“For God giveth to a man that is good in his sight wisdom, and knowledge, and joy: but to the sinner he giveth travail, t...”