首楞嚴義疏注經 6.208

6.208

香嚴童子宴晦清齋，聞香入鼻，觀此無生，來無所從、去無所至。塵氣既滅，妙香密圓。今此揀云：香之一法合有離無，既非其常，未為圓觀。

The youth Gandhahastin (Xiangyan), at leisure and in darkness during a pure fast, smelled incense entering his nose and contemplated this as non-arising, neither coming from anywhere nor going anywhere. Once the dust-breath was extinguished, the wonderful fragrance was secretly perfected. Here it is selected out by saying: the phenomenon of scent exists when in contact and is absent when apart; since it is not constant, it is not yet a perfect contemplation.