What was Martin Luther’s favorite psalm?

The answer is Psalm 118, of which Luther wrote,

“This is my own beloved Psalm. Although the entire Psalter and all of Holy Scripture are dear to me as my only comfort and source of life, I fell in love with this psalm especially. Therefore I call it my own. When emperors and kings, the wise and the learned, and even the saints could not aid me, this psalm proved a friend and helped me out of many great troubles. As a result, it is dearer to me than all the wealth, honor, and power of the pope, the Turk, and the emperor. I would be most unwilling to trade this psalm for all of it.”