Does anyone have reliable informations about the Heart Mantra of the Uṣṇīṣa Vijaya Dhāraṇī Sūtra (oṃ amṛta-tejavati svāhā) ? Does someone practice it ? If yes, what is your experience with it ?
As you see below, it is used in Shingon School :
source:https://books.google.fr/books?hl=fr&id=dm4_AQAAIAAJ (page 130)
In addition to the long dhāraṇī, there is the much shorter Uṣṇīṣa Vijaya heart-mantra:
oṃ amṛta-tejavati svāhā
The Heart Mantra :
oṁ amṛta tejovati svāhā ||