The verse within me

Once, when Rabbi Mordecai was in the great town of Minsk expounding the Torah to a number of men hostile to his way, they laughed at him, "What you say does not explain the verse in the least," they cried. 

"Do you really think," he replied, "that I was trying to explain the verse in the book?  That doesn't need an explanation! I want to explain the verse that is within me."