仁王般若經疏 2.125

2.125

"Great King! Just as the thusness of written words cultivates the mother of the wisdom of all buddhas, the root mother of wisdom of the nature of all sentient beings is precisely the substance of sarvajñā. Before all buddhas have attained buddhahood, they take the future buddha as the mother of wisdom, not having yet attained it as their nature; [when they have become buddhas,] they have already attained sarvajñā. The prajñā of the three vehicles is neither born nor extinguished, its self-nature is eternally abiding, because all sentient beings take this as their awakening nature."