Matthew 21:22 whatsoever ye shall ask in prayer believing. Ye shall. Receive.
Some say I asked and prayed and believed and it still wasn't answered. search your heart. What was your prayer. Sometimes we may have a loved one that is ready to go home and we pray for their pain and illness to go away. Well god answers it when he takes them home.
We become angry or sad because they are gone. And may lash out at God.But God it healing them by bringing them home where there is no sickness or pain. Sometimes we may not understand but. God knows what is truly right.
I often pray for God's will to be done. and if his will is my will thank you. And if not that he gives me the understanding and grace to handle what comes next.