Mamaivāṁśo jīva-bhūtaḥ (BG 15.7). We are a small particle. How much small? What is the magnitude? That is also described in the śāstra:
keśāgra-śata-bhāgasya satadhā kalpitasya ca jīvo bhāgasya vijñeyaḥ sa anantāya kalpate (Śvetāśvatara Upaniṣad 5.9) There is dimension of the living entity—one ten-thousandth part of the tip of the hair.
So it is very difficult with our these material eyes. We are very much proud of our eyes. But here is the indication from the śāstra, the length and breadth of the living soul. Now you find out with your eyes, your microscope. That is not possible. Because they cannot find out, they say nirākāra. Nirākāra, in one sense, it can be supported that we cannot ascertain the forms of the soul. And what . . . how we can ascertain the form of the Lord? Aṇor aṇīyān mahato mahīyān. So spiritual education means, spiritual enlightenment means, first of all, we must try to understand the jīva—because jīva is the small particle of the Lord—so that we can understand the quality of the Lord. Just like if you test a small particle of gold, then you can understand the composition of gold. If you test a little drop of water from the ocean, you can analyze the chemical composition of the sea. Similarly, if you can analyze the characteristics of the living entity, then you can at least understand what is God, what is the characteristics of God.