By 
Let them thank the Lord for his steadfast love, for his wondrous works to the children of man! For he satisfies the longing soul, and the hungry soul he fills with good things. (Psalm 107:8–9 ESV)
Mankind is a being that craves all sorts of things. We have physical instruments inside of us that crave things like food and drink. I for one crave my wife’s cooking. She is hands down the best cook on the entire planet. If I go two or three day eating other meals, I long for hers. I also crave sweets. This craving is by far not as good of a craving as desiring my wife’s cooking. Yet the longing is there none the less.
These physical instruments are meant to be pointers to the instrument of the soul. The soul of mankind is likewise an instrument of craving. It longs to be satisfied with things that are good. The physical appetite of the belly and the spiritual appetite of the soul are not disconnected. The alcoholic persists in his cravings because he thirsts for more than just a Brandy Manhattan or a Miller Genuine Draft. He thirsts for a soul to be free from guilt and be satisfied in that which is good. Yet only through Jesus is the soul of man satisfied.
God is the source who fills the soul of man with good things. These things are spiritual in nature, yet they are not disconnected from the physical. We crave for joy. We open our physical Bible and read that we are more than conquerers through Christ who loves us. We let this truth sink into the depth of our soul and we become filled with joy. We thirst for righteousness, and God sends physical suffering into a home. This physical suffering produces an enduring righteousness that satisfies the longing soul. None of these satisfactions will ever completely fill our cup of desires. God alone is the filler and he has made this world in such a way that we must continually dip our glasses in the fountain of his grace till we meet him face to face.
..he satisfies the longing soul, and the hungry soul he fills with good things.
Leading Family Devotions 