Once when he was a young man he [Martin Luther] happened upon a Bible. In it he read by chance the story about Samuel’s mother in the Books of the Kings. The book pleased him immensely, and he thought that he would be happy if he could ever possess such a book. Shortly thereafter he bought a postil; it also pleased him greatly, for it contained more Gospels than it was customary to preach on in the course of a year.
When he became a monk he gave up all his books. Shortly before this he had bought a copy of the Corpus iuris and I do not know what else. He returned these to the bookseller. Besides Plautus and Vergil he took nothing with him into the monastery. There the monks gave him a Bible bound in red leather. He made himself so familiar with it that he knew what was on every page, and when some passage was mentioned he knew at once just where it was to be found.
“If I had kept at it,” he said, “I would have become exceedingly good at locating things in the Bible. At that time no other study pleased me so much as sacred literature. With great loathing I read physics, and my heart was aglow when the time came to return to the Bible. I made use of the glossa ordinaria. I despised Lyra, although I recognized later on that he had a contribution to make to history. I read the Bible diligently. Sometimes one important statement occupied all my thoughts for a whole day. Such statements appeared especially in the weightier prophets, and (although I could not grasp their meaning) they have stuck in my memory to this day. Such is the assertion in Ezekiel, ‘I have no pleasure in the death of the wicked,’ etc. [Ezek. 33:11].” [Luther’s Table Talk].
And that, good reader, is how a theologian is made. If your theology is empty and soulless (or Emergent and Seeker Sensitive) or your Pastor’s preaching more fluff than substance (or cute stories than the development of exegetical themes), the reason lies in unfamiliarity from and disinterest in the Bible.
Luther was the theologian he was (and the same can be said of Calvin and Zwingli, Oecolampadius and Melancthon, Bullinger and Bucer) because he (and they too) was (were) biblical scholar(s) in the truest sense of the phrase.