Mantra

"Mantra is the sense of terminal intimacy with the sound – through which one's capacities become ‘self apparent’. Mantra is a ‘carrier wave’ on which the unique frequency of the yidam travels. By reciting mantra, one tunes oneself to the ‘frequency’ of the yidam."

The Bristol Talks, Ngak'chang Rinpoche, Aro Encyclopaedia