Link to Luther's Rogate Sermon -
Five Requirements for True Prayer
2. In the second place, it is necessary that we never doubt the pledge and promise of the true and faithful God. For even to this end did God pledge himself to hear, yea, commanded us to pray, in order that we may always have a sure and firm faith that we will be heard; as Jesus says in Matthew 21:22: “All things, whatsoever ye shall ask in prayer, believing, ye shall receive.” Christ says in Luke 11:9-13: “And I say unto you, Ask, and it shall be given you; seek, and ye shall find; knock, and it shall be opened unto you. For every one that asketh receiveth; and he that seeketh findeth; and to him that knocketh it shall be opened. And of which of you that is a father shall his son ask a loaf, and he give him a stone? or a fish, and he for a fish give him a serpent? Or if he shall ask an egg, will he give him a scorpion? If ye then, being evil, know how to give good gifts unto your children, how much more shall your heavenly Father give the Holy Spirit to them that ask him?” With this and like promises and commands we must consolingly exercise ourselves and pray in true confidence.
