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1 Peter 5:7 Casting all your care upon him; for he careth for you.
Worry makes you forget who's in charge. When the focus is on yourself, you worry. You become anxious about many things. You may worry that:
With time, your agenda becomes more important than God's. You're more concerned with presenting self than pleasing him--and you may even find yourself doubting God's judgement.
God has gifted you with talents. He has done the same to your neighbor. If you concern yourself with your neighbors talents, you will neglect yours. But if you concern yourself with yours, you can inspire both.
John 14:1 Let not your heart be troubled; ye believe in God, believe also in me.