Response to Emmet's "Bevans Ch 8"

I liked what Emmet said when he quoted Bevans, "The ordinary Christian believer is a theologian." I agree with Emmet's assertion that the ordinary believer has authority to develop their own hermeneutic. However, don't we develop our interpretations and applications of scripture from an education of the text? Therefore, it would be fair to say that those with a stronger education of the Bible would be more authoritative than the average believer. I don't think that Emmet touched on the subject of comparing the authority of the lay men with the professional minister but I think it is relevant. Being a minister is not like being a medical doctor or a lawyer, our authority is spiritual. Other Christians have the same ability to read, interpret and apply the scriptures as we do. Does our authority come from being a "professional minister" with a degree or from God, who gives revelation, clarity and insight?