We still worry because our faith is weak, or maybe because when we ask God for something we want it in our time and not His time. We forget to say if it be the will of God. Many times we pray only when we are in trouble or in need but God requires our constant attention. He knows how and when to answer us and if we wait on Him and not be anxious we would see that our prayers are answered just at the right moment.

Gods' timing is always right and He does not always answer our prayers the way we expect so we worry.

God makes it clear that worrying does us no good therefore it is a waste of time, trust God and worry lest.