When the Rebellion of TAIRA no Masakado and the Rebellion of FUJIWARA no Sumitomo broke out in 940, to address the situation, he presented 'Byakue kannon ho,' which even the Esoteric Buddhist high priests were said to have no knowledge of in those days, to the then person of power, FUJIWARA no Morosuke; and MIYOSHI was appointed to a responsible post.
940年に平将門の乱・藤原純友の乱が勃発した際、この対策のために時の権力者藤原師輔に、当時は密教の高僧でも知らなかったとされている「白衣観音法」を進上したことがきっかけで重用されるようになった。