How does the calming prayer help us manage volcanic emotions?

“I live in a high and holy place, but also with the one who is contrite and lowly in spirit, to revive the spirit of the lowly and to revive the heart of the contrite" (Isaiah 57:15).

What is prayer?

God reveals Himself through the Bible, the person of Jesus Christ, nature, and our conscience. Prayer is not revelatory. If it is neither revelatory for humans nor for God, what is prayer then?