Martin Luther stated the classic Protestant understanding of the perspicuity of Scripture in his own favorite (and arguably most important) writing, The Bondage of the Will.
According to sola Scriptura, any role Tradition, a Magisterium, Bible commentaries, or anything else may play in theology is simply to suggest interpretations and evidence to the believer as he makes his decision. Each individual Christian is thus put in the position of being his own theologian.
The Christian answer to this profound question is that Jesus Himself is the Truth.This is something all Christians agree on, but this answer does, however, raise more questions: How do we come to know Jesus as truth?