Martin Luther personally oversaw the creation of the Luther Seal, also known as the Luther Rose. It provides a beautiful summary of his faith, a faith that is common to all Christians of every place and time. Here is how Luther explained the meaning of the seal:
Grace and peace from the Lord. As you desire to know whether my painted seal which you sent to me has hit the mark, I shall answer most amiably and tell you my original thoughts and reason about why my seal is a symbol of my theology. The ﬁrst should be the black cross in a heart which retains its natural color so that I myself would be reminded that faith in the Cruciﬁed saves us. “For one who believes from the heart will be justiﬁed.” [Romans 10:10] Although it is indeed a black cross, which mortiﬁes and which should also cause pain, it leaves the heart in its natural color. It does not corrupt nature, that is, it does not kill but keeps alive. “The just shall live by faith” [Romans 1:17] but by faith in the Cruciﬁed. Such a heart should stand in the middle of a white rose to show that faith in joy, comfort and peace. In other words, it places the believer into a white, joyous rose for this faith does not give peace and joy like the world gives. [John 14:27] That is why the rose should be white and not red, for white is the color of the spirits and the angels. Such a rose should stand in a sky-blue ﬁeld, symbolizing that such joy in spirit and faith is a beginning of the heavenly future joy, which begins already, but is grasped in hope, not yet revealed. And around this ﬁeld is a golden ring, blessedness in Heaven lasts forever and has no end. Such blessedness is exquisite beyond all joy and goods, just as gold is the most valuable, most precious and best metal. This is my compendium theoligae (summary of theology). May Christ, our beloved Lord, be with your spirit until the life hereafter. Amen.