Chinese Esoteric Buddhist exercise was according to deity yoga as well as "three mysteries": mantra, mudra and mandala. These a few mysteries allow the Buddhist yogi to faucet into the human body, speech and head with the Buddhas.[ninety nine] The Chinese translation is 真言; zhenyan; 'legitimate terms', the Japanese on'yomi https://www.youtube.com/shorts/x-uzzNOcLMQ