Four Classes of Buddhist Tantra
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The Sarma tradition of new translation schools, recognizes four classes of tantra (Wyl. rgyud sde bzhi):
Three outer classes—
Charya Tantra and
And one inner class of tantra, which is called
The latter is divided into three:
Father Tantras, such as the Guhyasamaja Tantra, the King of Tantras;
Mother Tantras, such as the Chakrasamvara Tantra; and
Non-dual Tantras, such as Kalachakra.[1]
Source
sisseminna108
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