Sola Scriptura

In modern times, evangelical Protestants have advocated for the belief that the Bible is the only real standard of truth and true Christian praxis for the church. But is this how the early Jews and Christians, who wrote the biblical books , viewed their sacred texts? And what counted as those sacred texts? Furthermore, there is often a lack of clarity as to what is meant by the famous phrase that became a motto of the German Reformation: sola scriptura . Does it mean that the Bible is the only a