A satisfied youth will become an inactive youth and a lifeless soul.
When youth losses its restlessness it becomes efficient, lifeless and impotent like a machine.
Infertile by itself is incapable of producing anything and hence cannot create a new world order.
The words and thoughts in these lines are very much direct attack to the youth in our society who resort to their own cocoons once they find salvation in salaried income or other source of money. They hide in their own burrows of safe living and turn apolitical and inhumane in the long turn. The use of machines to evoke the resemblance to a very efficient youth sans soul is exceedingly truthful and beautiful at the same time ( if you think, there is beauty without an element of truth).