妙法蓮華經玄贊 4.5

4.5

Second, as for the essence according to supremacy, this has six categories: first, the essence that absorbs phenomena into principle. In the Nirvāṇa, Śrīmālā, and other texts, the dharmakāya, the true principle, and Buddha-nature are frequently named the Single Vehicle; hence the Śrīmālā states: 'The Single Vehicle is the Great Vehicle, the Great Vehicle is the Buddha Vehicle, and the Buddha Vehicle is the realm of nirvāṇa.' It also states: 'Practicing the six perfections for kalpas as numerous as the sands of the Ganges is not as good as someone hearing, receiving, reading, reciting, and even upholding a volume of this sūtra, not to mention someone explaining it extensively for others'—this compares conditioned practices with the unconditioned vehicle. The Nirvāṇa-sūtra says: 'The Single Vehicle is Buddha-nature.' This extinguishes the conjured city and reaches the jewel site, exclusively taking tathatā and the equality of the dharmakāya as the Single Vehicle.