Stated responsibly, sola Scriptura is a modest doctrine. The core idea is that Scripture is the church’s only infallible rule. A rule is a standard that governs the church’s faith and practice. Infallible means being incapable of error. So sola Scriptura is essentially the claim that Scripture is the only authority standing over the church that is incapable of error.
When stated like this, as it should, Sola Scriptura presents itself as almost common sense.
