If one's source of Parnassa is not earning him a living, a reason may be, he already has what H'shem decided he needs for the day or it may come from a different source altogether.
pg 407
Nefesh Hachaim
Dovid Hamelech explains, just as the soul does not get nourishment from food or drink so too H'shem is not sustained by our Torah, Tefilah and Mitzvot. H'shem designed the world that His involvement would be determined by the deeds of the Jewish people.
Gate 2 Chapter 6 pg 84
pg 407
Nefesh Hachaim
Dovid Hamelech explains, just as the soul does not get nourishment from food or drink so too H'shem is not sustained by our Torah, Tefilah and Mitzvot. H'shem designed the world that His involvement would be determined by the deeds of the Jewish people.
Gate 2 Chapter 6 pg 84
