But when you ask, you must believe and not doubt, because the one who doubts is like a wave of the sea, blown and tossed by the wind. (James 1:6 NIV)
Doubt can seep in and erode any foundation we may have in this life. Fears and uncertainty can rule us and keep us from our absolute best.
But when we believe, and we banish doubt the waves that hit us are simply that, waves not the entire ocean. We can learn to tread water while circumstances change.