The Light and How to Swing It is a quest starting item that leads to the Paladin version of the Royal Seal of Eldre'Thalas. The book was likely written by Uther the Lightbringer.
The Light and How to Swing It drops from all bosses in Dire Maul, and can be found inside of Dusty Tomes in Dire Maul.
The Light and How to Swing It as a Quest Objective
Patches and hotfixes
Patch 1.3.0 (07-Mar-2005): Added