Martin Luther 
Treatise on Good Works Luther [EPUB ebook] 

Luthers transformational idea of justification by faith alone was often misunderstood and misrepresented in the early years of the Reformation. In 1520, with his Wittenberg congregation in mind, Luther set out to clarify the biblical foundation of good works. In doing so he recast the very definitions of sacred and secular both for his own generation and ours.