mamaivānśho jīva-loke jīva-bhūtaḥ sanātanaḥ
manaḥ-ṣhaṣhṭhānīndriyāṇi prakṛiti-sthāni karṣhati || 7 ||

My Understanding : The soul is something we cannot see, yet it experiences all the sensations that the material body feels through the six senses.