श्रोत्रं चक्षुः स्पर्शनं च रसनं घ्राणमेव च ।
अधिष्ठाय मनश्चायं विषयानुपसेवते ॥ १५.९ ॥

śrotraṃ cakṣu: sparśanaṃ ca rasanaṃ ghrāṇam-eva ca |
adhiṣṭhāya manaścāyaṃ viṣayān-upasevate || 15.9 ||

Right introspection leads to enlightenment

Once this body-different nature of the Soul is grasped, the seeker has to develop his understanding properly. The body-different Soul will never be affected by any of the changes the body undergoes. Thus it is birth-free and death-free. In the same manner, while associated with the body too, it is unaffected in all the conditions like growth and decay.

As fire, blazing through many media, does not get the least affected by the character or plights of the media, the jiva too because of its pristine nature is not at all affected by the various plights of the body. The same idea he makes clearer in the next verse:

By presiding over the ear, eye, skin, tongue and nose and also the mind, it enjoys the multiple qualities of world objects.

Dwelling in the elemental body, which it has shaped itself, jiva experiences the world objects through the five senses and the mind. Here, the senses and the body fulfill the role of instruments or media. No experience belongs to any of these instruments, which are but means to contact the objects. In interacting with the objects around as well as getting the imprints of these, the senses and the body are merely employed by the jiva.

Think of a driver who runs a vehicle. The vehicle alone moves forward, backward, to the right or left. The driver makes it move variously, himself not undergoing any of those motions.