仁王護國般若波羅蜜多經疏 2.246

2.246

The commentary states: 'Display and guide' means revealing and leading. 'Response and transformation' refers to the body of enjoyment for others and the great and small transformation bodies, which are collectively called response and transformation. The pure dharmadhātu upon which response and transformation depend is neither identical to nor separate from the substance of these which depend upon it; therefore, response and transformation are both called the Dharmakāya. That is, the Tathāgatas pervade the dharmadhātu and manifest in response within the three realms, also harmonizing with the transformed; hence it is said they 'do not depart'. From here, the third part distinguishes the errors of non-Buddhists.