Ecclesiastes 1:13; Ecclesiastes 2:23; Ecclesiastes 2:26; Ecclesiastes 3:10; Ecclesiastes 5:3; Ecclesiastes 5:14; Ecclesiastes 8:16

13 And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

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

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, to gather and to heap up, that he may give to him that is good before God. This also is vanity and vexation of spirit.

10 I have seen the travail, which God hath given to the sons of men to be exercised in it.

3 For a dream cometh through the multitude of business; and a fool's voice is known by multitude of words.

14 But those riches perish by evil travail: and he begetteth a son, and there is nothing in his hand.

16 When I applied mine heart to know wisdom, and to see the business that is done upon the earth: (for also there is that neither day nor night seeth sleep with his eyes:)