2 posts • Page 1 of 1
It's important enough to be mentioned in several treatises by Kūkai that's interpreted through Shingon lenses like in the seminal work known as the 'Treatise on the Ten Stages of the Mind' (J: 十住心論 ; Jūjūshinron [Note: I haven't come across any full vernacular translation of this work but snippets of it are found in various published works). Then, in others like 'The Precious Key to the Secret Treasury' (J: 秘蔵宝鑰 ; Hizōhōyaku) & 'The Meanings of the Letter Hūṃ' (J: 吽字義 ; Unjigi). Give a thought to investing in owning these 1 2 to read about it. There's this free download site too but some may find the translation rather difficult to follow.