首楞嚴義疏注經 2.216

2.216

若汝現見物時，宛然分辨，阿難非佛、佛非阿難，此則世間顯然安立，皆汝見性周遍了知。此周遍性若非汝真，復是何耶？故結云非汝而誰。

If when you presently see an object, you clearly distinguish that Ānanda is not the Buddha and the Buddha is not Ānanda, then the world is clearly established, all through your nature of seeing all-pervadingly cognizing. If this all-pervading nature is not your reality, what else could it be? Therefore, it concludes: 'Who is it if not you?'