Spirituality automatically leads to humility. When a flower develops into a fruit, the petals drop off on its own. When one becomes spiritual, the ego vanishes gradually on its own. A tree laden with fruits always bends low. Humility is a sign of greatness.
I have no faith in human perfectability. I think that human exertion will have no appreciable effect upon humanity. Man is now only more active - not more happy - nor more wise, than he was 6000 years ago.
Anyone who refuses to marry is shrinking his farmwork, wasting the seed, and leaving idle the appropiate tools created by God; he sins against the purpose of creation and wisdom visible in the evidence of natural structure. The man who refuses to marry has severed a chain of being, a previously unbroken chain linking his own existence to that of Adam.