To nourish the soul means to become kinder, more compassionate, wiser, and more loving, often through the making of difficult choices that foster growth rather than safety. The nourishment and growth of the soul is very reason for human life. When we nourish the soul we nourish God, increasing the abundance of the life that we can see – our children, or society – and the levels of life we don't see at all. In a larger sense, soul is the substance of the universe, knowing itself and growing itself.
...Consider this then: That there is a level of truth, vitally important to human beings, which lies beyond the explainable, demonstrable natural world. In fact, this truth is often more important and sustaining to human beings because it is an eternal truth, not changeable, never at the mercy of different historical theories, or the whims of the scientist, or the observer of heavenly bodies. This truth, in a sense, is our spiritual food.