瑜伽論記 11.48

11.48

答曰：得此法已為眾生說，是即真實慈也。無緣四無量者，即是無分別智，遠離一切分別戲論，由得此智見平等理利他事成，是故此時名證極愛一子之地，故無緣慈無分別智以為體性，涅槃亦云：無緣者，緣於如來無緣法身，如來離分別故名作無緣。

The answer is: having attained this dharma, expounding it for sentient beings is true loving-kindness. The four unconditioned immeasurables are the non-conceptual wisdom that is far removed from all conceptual proliferation. Due to attaining this wisdom, one sees the principle of equality and the benefit of others is accomplished; therefore, this stage is called realizing the stage of loving all beings as an only child. Thus, non-conceptual wisdom is the essential nature of unconditioned loving-kindness. The Nirvāṇa [Sūtra] also says: 'Unconditioned' means taking the unconditioned dharmakāya of the Tathāgata as an object; because the Tathāgata is free from conceptual thought, it is called unconditioned.