Through the empowerment of the Three Mysteries (body, speech, mind), buddhahood manifests with great swiftness.
三密加持すれば速疾に顕わる。

Philosophers
Kūkai
Founder of Shingon Buddhism in Japan (774-835). He sailed to Tang China in 804 and studied esoteric Buddhism under Huiguo. He founded the monastery on Mt Koya and taught buddhahood in this very body.
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Source: 即身成仏義 (820年頃)Verified