The "Threefold Training" is based upon the Buddha's Eightfold Path to practice Buddhism that leads to enlightenment and Nirvana.  It is the way to end the Three Fires of greed, anger, and ignorance/delusion which would then lead to your true state of Nirvana (which is devoid of the Three Fires).  The Threefold Training is practiced by the different Buddhist traditions in different ways but can ultimately be found in all the different practices, rituals, ceremonies, and other things found within them.
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