Reformation 500_Sola Scriptura- Scripture Alone
Sola Scriptura, or "scripture alone" (literally: "by scripture alone"), is upheld by Lutheran and Reformed theologies and asserts that scripture must govern over church traditions and interpretations which are themselves held to be subject to scripture. All church traditions, creeds, and teachings must be in unity with the teachings of scripture as the divinely inspired Word of God.
Sola Scriptura asserts that the Bible can and is to be interpreted through itself, with one area of Scripture being useful for interpreting others. This principle is largely based on 2 Timothy 3:16, which says, "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness." That scripture can interpret itself is a means by which to show the unity of Scripture as a whole. As all doctrines are formed via scriptural understandings, all doctrines must be found to align with Scripture and as such are then subject to scripture before the believer can begin to apply them.
This particular sola is sometimes called the formal principle of the Reformation.