成唯識論演祕 2.155

2.155

Answer: There are two meanings. One says: In the causal stage they are distinct as Dharma and wisdom; in the fruition stage they are collectively the Buddha eye. Hence the *Mahāprajñāpāramitopadeśa* says: Just as four rivers reach the great lake and are collectively called the ocean. The second says: Non-conceptual wisdom is its entity, because its entity differs from the wisdom and Dharma eyes; or it is called the Buddha eye on account of great compassion.