Reason shows the soul the delusion of overrating worldly things, while faith teaches what alone can satisfy its cravings.
Teresa of Avila, The Interior Castle
The thirst of the soul cannot be slaked with material things because it is not of this material world. It takes something of an altogether different nature than fame and fortune, the natural enemies of tranquility, to satisfy the cravings of that which has its home in the spiritual realm.
Denney Home Place 
Natural desires can be satisfied while unnatural desires cannot. The thirst of the soul is then revealed as rightly belonging to our proper nature, as it can be fully satisfied.
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