The best antidote for [any worry] is frequent meditation upon God's goodness, power and sufficiency. When the saint can confidently realize "The Lord is My Shepherd," he must draw the conclusion, "I shall not want!" Immediately following our exhortation is, "but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God." Nothing is too big and nothing is too little to spread before and cast upon the Lord. The "with thanksgiving" is most important, yet it is the point at which we most fail. ...Before we receive God's answer, we thank Him for the same: it is the confidence of the child expecting his Father to be gracious. ~Selected
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
But let him ask in faith, nothing wavering. For he that wavereth is like a wave of the sea driven with the wind and tossed. For let not that man think that he shall receive any thing of the Lord.