Philippians 4:6-7.

Do you ever doubt God? Maybe He has called you to do something and you think, "But I've made too many mistakes." Or maybe the thing He asks seems impossible because its more than you think you can do. Or, maybe you think you don't have the skills needed to do what God asks - its more than you've done before and you don't feel up to the task. We all doubt God at times but would it comfort you to know that one of the most righteous men in all the Bible had the same doubts? He felt inadequate and unworthy, he doubted God and he doubted his ability to serve. He doubted it all!

Matthew 6:24-35.