During the time of my sojourn in India to pursue Ph.D. course of Buddhist Studies in the University of Delhi, I received from Ven. Tri Quang, Late Ven. Tinh Vien, Ven. Nhu Dien, Ven. Minh Chon, Late Ven. Minh Thanh, Ven. Hai Trieu Am... not only in terms of the generous material supports, but also that of the warm spiritual, have in deed created comfort and smooth conditions for me to keep mental peace and light-hearted in order to put whole my mind and will in study. I could not express my debt of gratitude to these most venerable Monks in words. In the course of writing this research work, I would like to express my deep gratitude specially to Dr. I. N. Singh, my respected supervisor - the Lecturer of Buddhist Philosophy in Department of Buddhist Studies, Delhi University, whose scientific method of guidance has developed in me a critical point of view, with self-confidence and inspired me to do my research work easily without his guidance, I could not be able to do this heavy task. I should also like to show my deep thankful to all the other professors, readers and lecturers of the Department, who directly or indirectly instructed me during the period of my study Buddhism from M.A. to Ph.D. courses at the place of its origination. I am also very grateful to all my friends - Venerable monks and nuns, lay-men and lay-women and Buddhist disciples have been kindly helpful in one way or another for my knowledge accomplishments, but their names are too many to be mentioned here. At last, my sincere acknowledgements go to those whose books have been well used for quotations and references in my research work and my thanks are also due to the library staff of Delhi University Library System and Research Services Section, Central Reference Library for research facilities and their helping hands. Delhi, March 30, 2003 Bhikkhuni Gioi Huong (thichnugioihuong@yahoo.com)