So advancement of knowledge means to understand his real position and act accordingly. That is knowledge. That is perfection of knowledge. Simply to understand that "I am Brahman" is not perfection. You have to still go further. Simply to understand that "I am Brahman," "I have now realized myself as Brahman," that is not perfection of knowledge. Brahma-bhūtaḥ prasannātmā (BG 18.54). One who becomes realized souls, self-realized, he becomes immediately perfectly joyful. Because our all lamentation is due to our material identification. Śocati kāṅkṣati. We are simply lamenting for our loss, and we are simply hankering for some gain. This is material activities. Everyone is struggling to gain something which he does not possess, and he's lamenting for something which he has lost. But when he realizes himself that "I have nothing to gain and nothing to lose; I have nothing to do with this material world," that is called brahma-bhūtaḥ. That is Brahman realization. Brahma-bhūtaḥ prasannātmā na śocati na kāṅkṣati, samaḥ sarveṣu bhūteṣu (BG 18.54). At that time, he realizes that all living entities, they are spirit soul, paṇḍitāḥ sama-darśinaḥ (BG 5.18). That is equal vision—not the bodily vision. So long we have got bodily vision, there cannot be any equality. That is not possible. When one sees only to the spiritual existence of a living entity, there is question of seeing equally, equal vision, universal brotherhood. That is possible. Not on the bodily platform. That is not possible.
So after acquiring this knowledge, the life of devotional service begins.
- brahma-bhūtaḥ prasannātmā
- na śocati na kāṅkṣati
- samaḥ sarveṣu bhūteṣu
- mad-bhaktiṁ labhate parām
- (BG 18.54)
That is required. And in that stage of devotional life, one can understand what is Kṛṣṇa.