The problem goes deeper than that, because Calvin was able to make his own interpretation of 'predestination' from Scripture only because of the Lutheran non-scriptural 'principle' that the Scriptures alone contain the teachings of Christ.
The early church did not have the New Testament books, the Apostles did not go round preaching while holding a book of the NT Scriptures, because they had not yet been written. Ask yourself how was it possible for the early Christians to bring Christ to thousands in the known world, if they did not possess the sole source of the teaching of Christ? The answer is that they had access to ANOTHER absolute source of revelation-which was free from the errors of human interpretation, namely the authority of the promised gift of the Holy Spirit whom Jesus sent to them with the expressed purpose of "guiding them into all truth".(John 16:13)
The Spirit is still active in the Church today and remains the only authentic arbiter of reliable interpretation of Scripture.