Psalm 91:14-15 Because he hath set his love upon me, therefore I will deliver him: I will set him on high because he hath known my name. He shall call upon me, and I will answer him: I will be with him in trouble; I will deliver him, and honour him.
The believer in Christ responds to trouble by setting his love upon the Lord. God promises to deliver and set on high the man who knows His name, that is, enjoys an intimate relationship with Jesus The Holy Spirit brings us into a family relationship with God by making us sons of God through our Baptism and through our faith in the Gospel. Because of what Christ has done we love Him and know Him.
Therefore, because we are His children, we may call upon His name (His person, His presence, and His power). When we call, He answers. He knows our need, cares about it, and does something. This is a promise we can take to the bank: He will be with us, deliver us, and honor us. Because Jesus died and rose for us, the Spirit brings us to faith through the gospel, and we believe Jesus, we may talk to Him. We pray because He commands us to and because He promises to hear us. “Deliver us from evil.”