Unlike an oak tree, the trunk of a palm tree is supple, which allows it to bend in the wind and when the hurricane subsides it stands tall again, stronger than before.
Our spiritual life must be supple, like a palm tree! When God does not deliver our needs we petitioned Him for in our prayers by speed courier and Satan blows hurricanes of doubt over our faith, don't be ripped out of your foundation like an oak. This is how Apostle James puts it: "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." (Jas1:6)