首楞嚴義疏注經 2.387

2.387

阿難白佛言：「世尊！必妙覺性非因非緣，世尊云何常與比丘宣說見性具四種緣，所謂因空、因明、因心、因眼。是義云何？」

Ānanda said to the Buddha: "World-Honoured One! If the wonderful nature of awareness is indeed neither cause nor condition, why does the World-Honoured One constantly preach to the monks that the seeing-nature is equipped with four kinds of conditions: namely, caused by voidness, caused by light, caused by mind, and caused by eyes? What is the meaning of this?"