Worry can be like holding a glass. The longer you worry about something, the more your fears weigh you down. Also, King David knew about fear. His son Absalom had stolen the allegiance of the nation of Israel from him and was attempting to take the throne for himself.
David didn't know who was loyal to him and who was against him. His only option seemed to be to run. He said to his servants, “Then we must flee at once, or it will be too late!” David urged his men. “Hurry! If we get out of the city before Absalom arrives, both we and the city of Jerusalem will be spared from disaster.”
In a psalm that David may have written while he was fleeing for his life, he wrote: "I cried to the Lord with my voice, and He heard me from His holy hill (Ps. 3:4). In the midst of his fear, David looked to the Lord, God showed him grace and restored him to the throne. These are plenty of worries that can weigh us down. But, as we release them into God's strong hands, He will help us through our trials. Worry is a burden that God never meant for us to bear.
Source: Our Daily Bread, 2016