Ecclesiastes 4:4; Ecclesiastes 4:6; Ecclesiastes 4:16

4 Then I saw that all toil and all skill in work come from a man's envy of his neighbor. This also is vanity and a striving after wind.
6 Better is a handful of quietness than two hands full of toil and a striving after wind.
16 there was no end of all the people; he was over all of them. Yet those who come later will not rejoice in him. Surely this also is vanity and a striving after wind.