He said he based his understanding on scripture alone, the principal of “sola scriptura.” But did he? Luther had concluded that because we were freely justified (made right with God) through grace, that all we needed was faith. This fit neatly with his background as an Augustinian friar, as it built on Augustine’s idea of predestination. So Luther’s salvation equation was Faith + 0 = Salvation. No “works” were needed. But was Luther right? https://worldtomorrow.ca/weeklycolumn/luthers-salvation-equation-is-it-correct/