Chuck says that God's sovereignty is the truth he turns to every day more than any other truth. And he preaches on it a lot because he needs to hear it just as much as anyone else.
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Your personal nourishment is crucial during times of storm. In panic moments, you'll cut a corner on your meals. You'll also fail to get sufficient sleep. It won't be long before you will set aside prayer altogether and you'll find yourself drained, spiritually. Increased emotional pain mixed with decreased spiritual renewal can be lethal to your faith.