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

4 I have seen that every labor and every skill which is done is the result of rivalry between a man and his neighbor. This too is vanity and striving after wind.

6 One hand full of rest is better than two fists full of labor and striving after wind.

16 There is no end to all the people, to all who were before them, and even the ones who will come later will not be happy with him, for this too is vanity and striving after wind.