The sum of all divine doctrine is simply Jesus Christ.
~Martin Luther~
Luther’s Epistle Sermons: Epiphany, Easter and Pentecost (Minneapolis, Minnesota; The Luther Press; 1909) Excerpted from a sermon titled: The Fruits of Faith. Our Spiritual Service. Preached on the first Sunday after Epiphany on Romans 12:1-6p. http://www.gutenberg.org/ebooks/28464. eBook
So when the devil throws your sins in your face and declares that you deserve death and hell, tell him this: “I admit that I deserve death and hell, what of it? For I know One who suffered and made satisfaction on my behalf. His name is Jesus Christ, Son of God, and where He is there I shall be also!
~Martin Luther~
Martin Luther, Letters of Spiritual Counsel, trans. and ed. Theodore G. Tappert (Vancouver, British Columbia: Regent College, 2003), 86–87
It is, then, fundamentally necessary and wholesome for Christians to know that God foreknows nothing contingently, but that He foresees, purposes, and does all things according to His own immutable, eternal, and infallible will.
~Martin Luther~
The Bondage of the Will (Grand Rapids, Michigan; Revell; 1957) p. 80
The Old Guys 