This book is a collection of three speeches delivered by the distinguished scholar Mr. Seyyed Mojtaba Hosseini at the headquarters of the Islamic Culture Broadcasting Institute in 2013 on the occasion of Arba’een. In these lectures, Mr. Hosseini has examined the secret why Ashura has prevailed for so long – a highly important issue – from a scholarly, research- minded perspective. Therefore, Islamic Culture Broadcasting Institute has decided to publish the written form of the lectures as a book.