Stockdale on Stoicism 26

Another thing. You do not control God. You must not refer to Him as "good" or "evil." 

Why not? If you pin these mundane terms on Him, reciting "God is good," people may become tempted, when things God controls run counter to what they're trying to do—weather being unfavorable for farmers or the wind being from the wrong direction for sailors—to start calling Him evil, too. 

And that's impious. 

Remember, says Epictetus: "Piety must be preserved. Unless piety and self-interest be conjoined, piety cannot be maintained in any man." 

—from James B. Stockdale, The Stoic Warrior's Triad 

IMAGE: Rembrandt, The Storm on the Sea of Galilee (1633) 

And he said unto them, "Why are you so fearful? How is it that you have no faith?" —Mark 4:40