Exoteric medicines sweep away dust; the mantra opens the treasure-house.
顕薬は塵を払い、真言は庫を開く。

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: 般若心経秘鍵 (818年)Verified