首楞嚴義疏注經 3.127

3.127

"Ānanda! If this flavor were born from your tongue, in your mouth there is only one tongue; if that tongue had at that time already become the flavor of butter, when encountering dark cane-sugar it should not shift. If it does not shift, it cannot be called knowing flavor; if it shifts, the tongue is not multiple in substance, so how could multiple flavors be known by a single tongue?"