The phrase emerged as one of the "Five Solas" during the 16th-century Protestant Reformation. Martin Luther championed it to challenge practices like the sale of indulgences , which he felt turned salvation into a transaction.
It defines grace as God's "unmerited favor" toward sinners. This means salvation cannot be earned through good works, religious rituals, or moral achievements. Gnade allein
It has lasting implications for Christian ethics, shifting the motive for "good works" from a way to earn God's favor to a response of gratitude for a gift already received. The phrase emerged as one of the "Five