首楞嚴義疏注經 3.53

3.53

「何以故？若甜苦來，淡則知滅，云何知淡？若從淡出，甜即知亡，復云何知甜苦二相？若從舌生，必無甜淡及與苦塵。斯知味根本無自性。若於空出，虛空自味，非汝口知。又空自知，何關汝入？」

"Why is this? If it came from the sweet and the bitter, then with the bland the awareness would be destroyed; how could it know the bland? If it emerged from the bland, with sweetness the awareness would vanish; how again could it know the two marks of sweet and bitter? If it arose from the tongue, there would definitely be no sweet, bland, or bitter dust. This root of knowing tastes would fundamentally lack an intrinsic nature. If it emerged from space, empty space would taste itself, and it would not be your mouth that knows. Furthermore, if space knows of itself, what does that have to do with your entrance?"