The following quote is taken from Liberating from the Success Syndrome.

Thus, the question that those of us who desire to succeed in God’s service must answer is: Do we know God’s Word, and are we growing in our knowledge of it? This is often an embarrassing question, even to the seminary-trained pastors, because advanced theological degrees do not guarantee biblical knowledge.

Indeed, we have known seminary graduates who have never once read the Bible through! At best, theological education can acquaint us with the language. the nuances of theology, the general arguments of the books, and pastoral methodology. But it cannot insure that we actually know our Bible.

Kent Hughes, Liberating Ministry from the Success Syndrome