Ecclesiastes 2:21; Ecclesiastes 4:4; Ecclesiastes 5:11

Ecclesiastes 2:21

21 When there is a man who has labored with wisdom, knowledge and skill, then he gives his legacy to one who has not labored with them. This too is vanity and a great evil.

Ecclesiastes 4:4

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.

Ecclesiastes 5:11

11 When good things increase, those who consume them increase. So what is the advantage to their owners except to look on?