Fear whispers to us that God is not really big enough to take care of us. It tells us we are not really safe in his hands. It causes us to distort the way we think about him...There is no limit to his presence. There is no place where we can go, no activity we can engage in, where he is not watching over us. "When you pass through the waters, I will be with you."
But fear tries to convince us it is not so. Fear has created more practicing heretics than bad theology ever has, for it makes us live as though we serve a limited, finite, partially present, semi-competent God.
John Ortberg, If You Want to Walk On Water, You've to Get Out of the Boat, Zondervan (2001), pp. 130-31