Gunatraya Vibhaga Yoga-Bhagavad Gita Chapter 14 [The Three Qualities of Material Nature]
Krishna Said > Shaloka: 11
The manifestations of the mode of goodness can be experienced when all the gates of the body are illuminated by knowledge.
There are nine gates in the body: two eyes, two ears, two nostrils, the mouth, the genital and the anus. In every gate, when the symptom of goodness is illuminated, it should be understood that one has developed the mode of goodness. In the mode of goodness, one can see things in the right position, one can hear things in the right position, and one can taste things in the right position. One becomes cleansed inside and outside. In every gate there is development of the symptoms of happiness, and that is the position of goodness.