諸經要集 2.37

2.37

又涅槃經云。若離四法得涅槃者。無有是處。何等為四。一親近善友。二專心聽法。三繫念思惟。四如法修行。以是義故。聽法因緣則得近於大般涅槃。何以故。開法眼故。世有三人。一者無目（譬凡夫人）二者一目（譬聲聞人）三者二目（譬諸菩薩）言無目者。常不聞法。一目之人。雖暫聞法其心不住。二目之人。專心聽受如聞而行。以聽法故。得知世間。如是三人。

Furthermore, the Nirvāṇa-sūtra says: If one could attain nirvāṇa apart from four things, that would be impossible. What are the four? First, drawing close to good friends; second, single-mindedly listening to the Dharma; third, focusing the mind in reflection; fourth, cultivating in accordance with the Dharma. Because of this meaning, the causal condition of listening to the Dharma allows one to draw near to Mahāparinirvāṇa. Why is this? Because it opens the Dharma-eye. There are three kinds of people in the world: the first has no eyes (an analogy for ordinary worldlings); the second has one eye (an analogy for śrāvakas); the third has two eyes (an analogy for bodhisattvas). Those said to have 'no eyes' consistently do not hear the Dharma. As for the person with 'one eye', although they temporarily hear the Dharma, their mind does not abide in it. As for the person with 'two eyes', they single-mindedly listen and accept it, and practice in accordance with what they have heard. Because of listening to the Dharma, one is able to know the world has these three kinds of people.