God Is Unchangeable

The Jesus said to him, "Be gone, Satan!"
God Is Unchangeable
Christ manifested Himself in the flesh to snatch us from death, from the power of the devil. From this knowledge must come great joy and delight that God is unchangeable, that He works in accordance with unchangeable necessity, and that He cannot deny Himself (2 Timothy 2:13) but keeps His promises. . .. One must refrain from debates and say: "I am a Christian; that is, the Son of God was made flesh and was born; He has redeemed me and is sitting at the right hand of the Father, and He is my Savior." Thus you must drive Satan away from you with as few words as possible and say: "Be gone, Satan! (Matthew 4:10.) Do not put doubt in me. The Son of God came into this world to destroy your work (1 John 3:8) and to destroy doubt." Then the trial ceases, and the heart returns to peace, quiet, and the love of God.

From Lectures on Genesis (Luther's Works 5:48-49)
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