The arguments contained in the works of the scholars belonging to the School of the Ahl al-Bayt (‘a) are of unique significance. That is because they are based on genuine scholarship and appeal to reason, and avoid prejudice and bias. These arguments address scholars and thinkers in a manner that appeals to healthy minds and wholesome human nature. To assist the seekers of truth, the Ahl al-Bayt World Assembly has endeavored to present a new phase of these arguments contained in the studies and translations of the works of contemporary Shi‘ah writers and those who have embraced this sublime school of thought through divine blessing. The Assembly is also engaged in edition and publication of the valuable works of leading Shi‘ah scholars of earlier ages to assist the seekers of the truth in discovering the truths which the School of the Prophet’s Household (‘a) has offered to the entire world. The Ahl al-Bayt World Assembly looks forward to benefit from the opinions of the readers and their suggestions and constructive criticism in this area. We also invite scholars, translators and other institutions to assist us in propagating the genuine Islamic teachings as preached by the Prophet Muhammad (S). We beseech God, the Most High, to accept our humble efforts and to enable us to enhance them under the auspices of Imam al-Mahdi, His vicegerent on the earth (may Allah expedite his advent). We express our gratitude to Ayatullah Muhammad Taqi Misbah Yazdi, the author of the present book, and Mr. Kelvin Lembani (Muhammad ‘Abd al-‘Aziz), its translator. We also thank our colleagues who have participated in producing this work, especially the staff of the Translation Office. Cultural Affairs Department The Ahl al-Bayt (‘a) World Assembly