This book contains both logical and textual proofs for the tenets of Islam. It is written by one of the leading figures of the Religious Seminary in Qum. It is the largest Shiite religious seminary, containing over sixty thousand students and researchers. The highest level in the Shiite Traditional Usuli Seminary is the Kharij. In Qum, the most popular teacher of Kharij in terms of attendance and material, is the Grand Ayatullah Shaykh Husayn Vahid Khorasani (may Allah protect him), the author of this book.