[T]he appearance of those in the six destinies manifests the sufferings of saṃsāric existence. The appearance of those in the two vehicles manifest the bliss of nirvāṇa. The appearance of the Buddha realm manifests neither saṃsāra nor nirvāṇa. The Buddha realm is said to be most supreme because it consists of the middle path [which is] eternal, blissful, selfhood, and pure.