When John G. Mitchell, of Multnomah School of the Bible, was pastor of the First Presbyterian Church in Tacoma, Washington, he heard Dr. G. Campbell Morgan preach. The man knew his text, and young Mitchell was impressed. In fact, he asked the visiting Bible teacher how he understood Scripture so well.
“If I told you, you wouldn’t do it,” the older man said.
“Just try me,” Mitchell insisted.
“Before I study a book, I read it fifty times,” the veteran explained.
From Bible.org