Soon to bentch Geshem. Geshem, in ancient agricultural community Palestine, the assurance of good crops, plentiful harvest. Without it: drought, famine, disease... Therefore is symbol of prosperity, economic well-being. Very fact that we recite blessing over geshem and make it a central part of our prayers on this holiday shows that we are not other-worldly, that Judaism not look down upon desire for prosperity. Prosperity is a laudable, praiseworthy goal; provided, of course, that we understand that we are to attribute its attainment to G-d, and that we use it in the ethical and moral ways desired by G-d. That is why we incorporate it into our Tefillos.