Praying for a long time and not getting an answer doesn't come naturally to us. But God wants us to pray persistently because there is power in persistent prayer.
When God does not answer our prayers, does that mean, we have prayed against God's will? Or that we have prayed without faith or authority?
Psalm 91 is a well-known prayer for protection and deliverance. In times of crisis, there is one place we can always run to: the arms of our Heavenly Father! Where He is, no evil can be also. In His shadow, disaster cannot reach us.