注大乘入楞伽經 5.218

5.218

二釋品名者，梵音佛陀，此云覺者。梵乾栗陀耶，此名真實心，即一切佛自性離垢妙淨明心也，故名〈佛心品〉。

Second, as for explaining the chapter title: The Sanskrit sound Buddha is translated here as 'Awakened One'. The Sanskrit hṛdaya is named here 'the true mind', which is the wondrous, pure, and luminous mind of all Buddhas that is intrinsically free from defilement; hence it is named the 'Chapter on the Buddha Mind'.