Increase in Learning by David A. Bednar.
This is a book worth reading, marking, answering the questions in it, and asking your own questions in it. It comes with a companion DVD of Sheri Dew interviewing Elder David and his wife, Susan Bednar. If you pay the price and take the invitations to act that Elder Bednar gives in the book, you will become a changed person. I invite you to do so.