The Bible is a plain book. It is intelligible by the people. And they have the right, and are bound to read and interpret it for themselves; so that their faith may rest on the testimony of the Scriptures, and not on that of the Church. Such is the doctrine of Protestants on this subject.
By the completeness of the Scriptures is meant that they contain all the extant revelations of God designed to be a rule of faith and practice to the Church.
It only stands to reason that our first task is to draw close to God by getting to ‘know you the only true God, and Jesus Christ whom he has sent.’ (John 17:3) We do know that he has already reached out to us through his Word the Bible, a revelation about him, and his will and purposes for his creation. One way that we can grasp his instruction for us is by studying his Word.