" if He pretends that He is unfriendly and angry with you inasmuch as He does not want to hear you and help you, then say: “Lord God, You have promised this in Your Word. Therefore You will not change Your promise. I have been baptized: I have been absolved.” If you persistently urge and press on in this way, He will be conquered and say: “Let it be done unto you as you have petitioned, for you have the promise and the blessing. I have to give in to you. For a constant and persistent seeker and petitioner is the sweetest sacrifice.” It "

― Martin Luther , Lectures on Genesis: Chapters 31-37 (Luther's Works, #6)