As Eka thought it impossible to orally transmit the in-depth teachings of Esoteric Buddhism, he made a Tang painter draw Ryokai-mandala and gave it to Kukai.
恵果は、密教の奥義は言葉では伝えることがかなわぬとして、唐の絵師に命じて両界曼荼羅を描かせ、空海に与えた。