四明十義書 2.104

2.104

又云：下界眾生多著外色，故多令觀於唯心，非謂心獨是理。蓋為彼之師資因見教文多論心法具造諸法，便將心法直約理釋，意謂真心隨緣造於生佛諸法，所以凡見談真說理便謂已是觀心。為破此計，故引《四念處》下界眾生著色之文，令知經論多為破於下界眾生迷著，故偏多約心論觀。是則為破著色病，故多說觀心，非謂心獨是理故乃多說觀心。

It also said: 'Sentient beings of the lower realms are mostly attached to external form; hence they are largely directed to contemplate mind-only; it does not mean that the mind alone is principle.' This was because that teacher and disciple [Wu'en and you], seeing that the texts of the teachings often discuss the mental factor as fully creating all phenomena, directly explained the mental factor in terms of principle, thinking that the true mind follows conditions to create the phenomena of sentient beings and Buddhas; therefore, whenever they saw speaking of the true or discussing principle, they claimed it was already contemplating the mind. In order to refute this assertion, I cited the passage from the Si nianchu on sentient beings of the lower realms being attached to form, to make it known that sūtras and treatises mostly focus their discussions of contemplation on the mind in order to break the deluded attachments of sentient beings of the lower realms. Thus, it is to break the disease of attachment to form that contemplating the mind is frequently taught, not because the mind alone is principle that contemplating the mind is frequently taught.