Then, when practicing in the practice of the Tantras in question, the practitioner is strictly used
to perform the duties entrusted to him, such as for example the repetition of a spell(sngags- mantra).
Already in the early Hindu texts, we can read that the practice of purifying mantras of the mind leads to the experience of a contemplative vision related to the meaning of the mantra-
analogous explanation can be found in the Tantras of Tibetan Buddhism.