He behaved modestly, not wanting to bring any special attention to himself. His complete knowledge and understanding of the requirements of mitzvot, would never impel him to render halachic decisions for others, because he did not want to assume such a great responsibility.
He was modest and avoided drawing attention to himself. He believed his deep understanding of Jewish religious laws (mitzvot) wouldn't allow him to make legal judgments for others, as he didn't want the burden of such significant responsibility.