維摩經玄疏 6.79

6.79

答曰：如向所辨，一法異名，諸經雖不作實相名說。若說中道、法界、如來藏、正因佛性、本有涅槃，皆是實相異名，即為眾經作體也。

Answer: As distinguished above, there are different names for the one dharma. Although the various sūtras do not speak using the name 'true mark', if they speak of the middle way, the dharma-realm, the tathāgatagarbha, the direct-cause buddha-nature, or primordial nirvāṇa, these are all different names for the true mark, which serves as the substance for all the sūtras.