Ecclesiastes 4:4-8

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. The fool folds his hands and consumes his own flesh. One hand full of rest is better than two fists full of labor and striving after wind. Then I looked again at vanity under the sun. There was a certain man without a dependent, having neither a son nor a brother, yet there was no end to all his labor. Indeed, his eyes were not satisfied with riches and he never asked, “And for whom am I laboring and depriving myself of pleasure?” This too is vanity and it is a grievous task.