大般涅槃經義記 8.190

8.190

下合顯法。「眾生亦爾」合前人也，「悉皆有心」合有乳酪。「凡有心者定得菩提」合有人問汝有蘇耶答言我有。「以是義故我說一切悉有佛性」合以定得故言有蘇。凡有心者皆有真識覺知性故，定得菩提。外草木等無真心故，終無得義。此乃宣說能知之性。若論所知境界之性，一切皆有，不局有心。

Below is the application to reveal the dharma: 'Sentient beings are also like this' applies to the person mentioned above; 'all possess a mind' applies to having milk and curds. 'Whoever has a mind is certain to attain bodhi' applies to someone asking 'Do you have ghee?' and the reply 'I have it.' 'For this reason I say that all fully possess buddha-nature' applies to saying that one has ghee because it is certain to be obtained. Because whoever has a mind possesses the cognizant nature of true consciousness, they are certain to attain bodhi. External grasses, trees, and the like lack a true mind, so they never have the sense of attaining it. This proclaims the nature that can know. If one discusses the nature of the objective realm that is known, all things possess it, not being restricted to those having a mind.