TADYATHA OM MUNE MUNE MAHA MUNEYE SVAHA
Most Tibetan texts say MUNI MUNI MAHA MUNIYE. According to one Rinpoche who is a Sanskrit expert, that is mistaken. In Tibet, the Sanskrit language was not commonly learned in the monasteries, and I think there is a possibility that mantras are correct at the beginning, and then later, here and there, small things can be missing. So it is MUNE MUNE, not MUNI MUNI. There are a few scriptures where you find the correct version like that.
TADYATHA means “like that” – how to achieve enlightenment. SVAHA means establishing the base in your heart by having devotion. If you have that, you actualize the meaning of MUNE MUNE. This is the graduated path of the lower capable being, the graduated path of the middle capable being and the graduated path of the higher capable being. This also includes that tantric path. The first MUNE refers to completing the graduated path of the lower capable being, by having ceased attachment to this life, all the superstitious concepts. The second MUNE means having accomplished the graduated path of the middle capable being, having ceased attachment to samsaric perfection. The second MUNE can also mean ceasing ignorance through realizing emptiness, and this can also contain the paramitayana and also the tantra teaching. All three vehicles are in the MUNE MUNE. MAHA MUNEYE means having ceased the self-cherishing thought by actualizing the Mahayana path.
Therefore, the complete path to enlightenment is in TADYATHA OM MUNE MUNE MAHA MUNEYE SVAHA. The path comes in two parts, method and wisdom. When you completely actualize these, what happens is OM. OM is made of three syllables – AH, U, and MA – which signify your purified body, speech and mind. Then you achieve the completely pure body, speech and mind of the Buddha. SVAHA establishes the base in your heart, and through that, you actualize the meaning of MUNE MUNE MAHA MUNEYE, and then you achieve the OM – the complete pure holy body, speech and mind of the Buddha. Then you are able to work perfectly for sentient beings.
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HIS EMINENCE Lama Zopa Rinpoche
https://fpmt.org/mandala/archives/mandala-issues-for-2009/october/commentary-on-the-epithets-of-the-buddha/