1 Peter 5:6-7

Therefore humble yourselves under the mighty hand of God, so that He may exalt you (to a place of honor in His service at the appropriate time, casting all your cares (all your anxieties, all your worries, and all your concerns, once and for all) on Him, for He cares about you.  

We were never designed to be all-knowing Gods.  The devil will try to keep us in worry because it stops God from being able to move on our behalf.  So we are to be humble before God and understand our role is to believe in God for the answer and act when instructed by the Holy Spirit.  Jesus did the work for us on the cross, and we need to receive it.