Help What were the core principles of the first Protestant denominations that led to the period known as the Reformation? How did further Protestant denominations differ from the original ideas of Martin Luther?

 All of the solae show up in various writings by the Protestant Reformers, but they are not catalogued together by any. In 1916, Lutheran scholar Theodore Engelder published an article titled "The Three Principles of the Reformation: Sola Scriptura, Sola Gratia, Sola Fides" ("only scripture, only grace, only faith").

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