Psalm 21:13 Be exalted, Lord, in thine own strength: so will we sing and praise thy power.
David’s response to God’s great salvation, deliverance, and answered prayer is to sing and praise the Lord. He exalts the Lord, that is, lifts Him up to the highest position in Creation. But it is not that the Lord needs our exalting to be lifted up; He is already exalted to the highest whether we believe it or not. However, we need to lift Him up in our own minds so that we might see the reality that is already there.
We exalt His strength and praise His power, so that we know He is the Almighty God, Creator, Owner, and Ruler over all things. As we build up the Lord in our own awareness so we build up our faith. We praise God and sing His praises before we pray and ask. We thank Him after we pray.
We open our prayer with “Our father who art in heaven,” to strengthen our faith to believe that He can (He is in heaven) and that He will (He is our father who loves us. Our prayer needs may appear difficult, even impossible, to us, but we exalt Him for the strength and power to do the impossible. And we know that He loves us like the ideal Father. With that kind of faith in the heart we pray. Our limited minds cannot grasp the awesome strength and power of Almighty God our Father, so we respond to trouble by exalting, singing, and praising God our Savior, so that we might believe what an awesome God we serve, who loves us.