The True Center of Salvation

"Behold, I am the one who has laid as a foundation in Zion, a stone, a tested stone, a precious cornerstone, of a sure foundation . . .."
ISAIAH 28:16
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The True Center of Salvation
You also know the true center and foundation of your salvation from whom you are to seek comfort in this and all troubles, namely, Jesus Christ, the cornerstone. He will not waver or fail us, nor allow us to sink or perish, for He is the Savior and is called the Savior of all poor sinners, and of all who are caught in tribulation and death, and rely on Him, and call on His name. [Christ] says: "Be of good cheer; I have overcome the world." If He has overcome the world, surely He has also overcome the sovereign of this world with all his power. But what else is [the devil's] power but death, by which he has made us subject to himself, [and] held us captives on account of our sin? But now that death and sin are overcome, we may joyfully and cheerfully listen to the sweet words: "Be of good cheer; I have overcome the world." We certainly are not to doubt that these words are indeed true.

From Luther's May 20, 1531, letter to his mother, Margaret (Luther's Works 50:17)