- keśāgra-śata-bhāgasya
- satadhā kalpitasya ca
- jīvo bhāgasya vijñeyaḥ
- sa anantāya kalpate
- (Śvetāśvatara Upaniṣad 5.9)
The spirit soul is measured, first of all, divide the tip of your hair into one hundred parts, and then take one part again, and again divide it into one hundred parts. That portion is the measurement of the soul. Or, in other words, one ten-thousandth part of the tip of your hair.
Now, we have no measuring instrument. Therefore, because we have no measuring instrument, although the soul is there within this body, we cannot find it out. Although the soul and the Supersoul both are situated within the heart, and the heart is the center of all vitality, energy of this body . . .
That is accepted. But we have no eyes to see the soul or the Supersoul because these material eyes are blunt, imperfect. You cannot see so many things. I cannot see even my eyelids, the nearest, and I cannot see which is far, far away, distant place.
So all our senses are imperfect. By imperfect senses you cannot see the spirit soul. You cannot see even the spirit soul; how you can see the Supreme Soul, God? That is not possible. You have to purify your senses. Then you can see. Ataḥ śrī-kṛṣṇa-nāmādi na bhaved grāhyam indriyaiḥ (CC Madhya 17.136).