Sola Scriptura (Lat., ‘by scripture alone’). The belief that the truths of Christian faith and practice can and must be established from scripture alone, without additions from, e.g., tradition or development. [source]
Easy to believe in 2014 when I have about 20 Bibles in my house from about 12 different translations and about 4 different languages. If Scripture alone, apart from interpretation of a magisterium, apart from Sacred Tradition, apart from the Sacraments was enough to save us and govern our lives, what did the Christians do for the first 400 years of the Church? The cannon of Scripture was not closed and affirmed (by the authority of the magisterium and Church council, ironically) until 405 AD. For the first 400 years of the Church most Christians did not have the Bible to read (most were illiterate anyway!) for personal study and application.
What did they have for spiritual food???? How were they converted???? How did the Word get into them????