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In page Vajrayana:

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Vajrayāna Buddhism is esoteric in the sense that the transmission of certain teachings occurs only from teacher to student during an empowerment (abhiṣeka), and their practice requires initiation in a ritual space containing the mandala of the deity.[1] Many techniques are also commonly said to be secret, but some Vajrayana teachers have responded that secrecy itself is not important and only a side effect of the reality that the techniques have no validity outside the teacher-student lineage.[citation needed]