The morality of work is the morality of slaves, and the modern world has no need of slavery.
One of the symptoms of approaching nervous breakdown is the belief that one's work is terribly important and that to take a holiday would bring all kinds of disaster.
I want to say, in all seriousness, that a great deal of harm is being done in the modern world by belief in the virtuousness of work, and that the road to happiness and prosperity lies in an organized diminution of work.