There is nothing as troubling as what we think often. Our circumstances may be out of control we either have the right to worry or pray you can do one but not both. Worrying is taking responsibility of what God should take care of while praying is reminding God of what he has already promised you.
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Mind what goes inside of you, they make the best of you and also destroy the best of you. The thought is one of the most outstanding gift God gave to every man and woman. Please manage it very well. You will succeed. 