Answered Prayer

Psalm 6:9 (New Living Translation) "The Lord has heard my plea; the Lord will answer my prayer."

Why is it that we wait until there is nothing else to do and then pray, knowing that God hears a prayer spoken in faith? Why is it that we think God is not listening when His answer is "no"?

Won't it be revealing in eternity to learn how many prayers God has answered on our behalf that we don't even know were prayed for us?