INTRODUCTION
Since the 20th century, in Vietnamese culture as well as in
world literature there have been two more terms: (i) Cao Đài Giáo or đạo Cao Đài
(Caodaism), as an abbreviated name; (ii) Đại
Đạo Tam Kỳ Phổ Độ (the Third Universalism of the Great Way), as the full
form of the former.
But why this little
S-shaped country on the eastern coast of the Indochinese peninsula? Why has it
become the chosen land? This fact is the pride of patriotic Caodaists, but the
question requires an answer. One of the many factors answering the question is
the long-lasting moral and cultural tradition of the Vietnamese nation, deeply
absorbing the Three Teachings (Confucianism, Daoism, and Buddhism) introduced
from China  and India 
In other words, the
Vietnamese nation has absorbed a Three-Teaching culture for nineteen centuries.
This historical depth has formed one of some preconditions for the birth of
Caodaism in Vietnam 
With concise data
sifted from other authors’ works, and from Vietnamese history and literature, I
hope that this monograph could give a broad overview of the nineteen-century-long
progression of the Three Teachings in Vietnam 
Part I briefly
introduces some Vietnamese Confucian scholars' philosophical works. Vietnam 
Part II is a preliminary collection of some information, and
it might contribute to the understanding of Vietnamese Daoism, a domain not
much studied so far.
Part III is merely sketchy because lots of books on the history
of Vietnamese Buddhism are available for those who need a thorough research
nowadays.
Part IV represents religious tolerance, which is a very
precious virtue of the Vietnamese during the historical progression of
absorbing the Three Teachings. This tolerance results in several works
expressing the Vietnamese nation’s equalitarianism towards the Three Teachings.
This part is supplemented by parts V and VI.
Part V surveys the theme of part IV in the context of folk
literature.
Part VI quotes a number of Vietnamese authors' works written
before the 20th century and chronologically presents some typical literary and
philosophical data.
Thus, the core of this monograph lies in parts IV, V, and VI
in order to show that since ancient times the Vietnamese have had clear and
fair awareness of the Three Teachings. Whether they are Buddhist monks, Daoist
priests, or Confucian scholars, intellectuals or labourers, court officials or
rural peasants, the Vietnamese – with their practical
thinking and historical activities as well as their literary and philosophical
creation over nineteen centuries – have affirmed their humanistic virtue, i.e.,
their ability to regcognize the only intrinsic principle underlying all
religious manifestations. Consequently, despite the existence of various
beliefs, Vietnam 
HUỆ KHẢI
