Luther was angry with the Pope selling indulgences, referred to as “Papal Indulgences” at the time, which were essentially payments for the remission of punishment on sins.
He views Christian liberty as one which should be exercised in order of following and serving Christ, “through penalties, death and Hell.” This was the theory he utilized in condemning the sale of these indulgences as he stated they provide a “false security of peace.” Luther also believes that by acts of love, does a man get better, and indulgences only free them of penalties, and does not in fact make the buyer any better.
I approve of Luther’s ideas as I also do not support indulgences. I think that Luther’s 95 Theses made sense and was definitely very impactful in the Reformation of the Church at the time.