Sola scriptura (Latin: "by Scripture alone") is the doctrine that all teachings concerning faith and life that are necessary for salvation are taught in the Bible and nowhere else; or, alternatively, it is also called a guiding Lutheran principle that the Bible is the benchmark for all things and through it all things are judged. It does not mean that everything that is true is addressed in the Bible or that the Bible is written clearly enough for every believer to find and understand all that is contained therein equally as well as every other believer. It was a pillar of the Protestant Reformation, which rejected Roman Catholicism's claim that Tradition has as much authority within the Church as the Bible.
- Hans-Joachim Beeskow (2006). Paul Gerhardt 1607 - 1676 An Illustrated Biography. Heimat-Verlag Lübben, 99. ISBN 3-929600-33-1.
-  Sola Scriptura and the Early Church