I have a history of fear and worry. By the grace of God, I've largely overcome it, but it still raises its ugly head and tries to get a foothold every now and then.
Last night our pastor taught on Luke 12:22-34. He said this about worry:
Worry is a sin directly against God. It says to God, "You are not enough. I do not believe you can meet my needs. You are not big enough to handle my problems. You are not sufficient to take care of me."