There are two kinds of souls who are liberated even while in material bodies: the soul liberated by devotional service and the soul liberated by the cultivation of knowledge. The liberated soul in devotional service, attracted by the transcendental qualities of Kṛṣṇa, becomes more and more elevated, whereas those who engage in dry speculation and simply cultivate knowledge without devotion fall on account of their many offenses. This is confirmed in Śrīmad-Bhāgavatam (10.2.32), where it is stated:
- ye ’nye ’ravindākṣa vimukta-māninas
- tvayy asta-bhāvād aviśuddha-buddhayaḥ
- āruhya kṛcchreṇa paraṁ padaṁ tataḥ
- patanty adho ’nādṛta-yuṣmad-aṅghrayaḥ
"O Lord, the intelligence of those who think themselves liberated but who are without even a touch of devotional service is not pure. Even though they rise to the highest point of liberation by dint of severe penances and austerity, they are sure to fall down again into this material existence, for they do not take shelter at Your lotus feet." Lord Kṛṣṇa confirms this is in the Bhagavad-gītā (18.54):
- brahma-bhūtaḥ prasannātmā na śocati na kāṅkṣati
- samaḥ sarveṣu bhūteṣu mad-bhaktiṁ labhate parām
"One who is actually situated in Brahman realization is fully joyful, has no reason to lament or desire anything, and is equal to everyone. Thus he is eligible for pure devotional service." This was illustrated by Bilvamaṅgala Ṭhākura, who in his later life wrote: "I was situated as a monist in order to become one with the Supreme, but somehow or other I contacted a naughty boy and became His eternal servitor." In other words, those who attain self-realization by the execution of devotional service attain a transcendental body, and, being attracted to the transcendental qualities of Kṛṣṇa, engage fully in pure devotional service.