It is said that man does not live by bread alone. As there is food for the body, there needs to be a different type of food for the soul. In addition to the hunger that the body feels, the soul also feels its own hunger. The soul HUNGERS TO BE OF SERVICE, to make a difference, to honor God, and benefit its fellow living beings.
We get fed spiritually by doing what Krishna wants us to do. We get nourished by helping people. Satisfaction strength peace and joy come through serving others and serving God.