A dharani is a type of ritual speech similar to a mantra. The terms dharani and
mantra may even be seen as synonyms, although they normally used in distinct contexts.
The Japanese Buddhist philosopher Kūkai drew a distinction between dharani (dhāra.nī) and
mantra and used this as the basis of his theory of language. Mantra is restricted to esoteric Buddhist practice whereas
dharani is found in both esoteric and exoteric ritual. Dharanis for instance are found in the Pali
Canon see below. Kūkai coined the term "shingon" (lit "true word") as a Japanese
translation of mantra.
The word dharani derives from a Sanskrit root dh.r which means to hold, or maintain. Ryuichi Abe suggests that it is generally understood as a mnemonic device which encapsulates the meaning of
a section or chapter of a sutra. This is perhaps related to the use of verse summaries at the end of texts as in the Udana which
is generally acknowledged as being in the oldest strata of the Pali Canon. Dharanis are also considered to protect the one who
chants them from malign influences and calamities.
The distinction between dharani and mantra is a difficult one to make. We can say that all mantras are dharanis but that not
necessarily all dharanis are mantras. Mantras are generally shorter. Both tend to contain a number of unintelligible phonic
fragments such as Om, or Hu.m which is perhaps why some people consider them to be essentially meaningless. Kūkai made mantra a
special class of dharani and argued that every syllable of a dharani was a manifestation of the true nature of reality — in
Buddhist terms that all sound is a manifestation of shunyata or emptiness of self-nature. Thus
rather than being devoid of meaning, Kūkai suggests that dharanis are in fact saturated with meaning — every syllable is symbolic
on multiple levels.
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