Srimad Bhagavatam Canto 10 Chapter 14 Verse 5-6

Text 5

pureha bhūman bahavo ’pi yoginas
tvad-arpitehā nija-karma-labdhayā
vibudhya bhaktyaiva kathopanītayā
prapedire ’ñjo ’cyuta te gatiṁ parām

 Translation

O almighty Lord, in the past many yogīs in this world achieved the platform of devotional service by offering all their endeavors unto You and faithfully carrying out their prescribed duties. Through such devotional service, perfected by the processes of hearing and chanting about You, they came to understand You, O infallible one, and could easily surrender to You and achieve Your supreme abode.

 Text 6

tathāpi bhūman mahimāguṇasya te
viboddhum arhaty amalāntar-ātmabhiḥ
avikriyāt svānubhavād arūpato
hy ananya-bodhyātmatayā na cānyathā

 Translation

Nondevotees, however, cannot realize You in Your full personal feature. Nevertheless, it may be possible for them to realize Your expansion as the impersonal Supreme by cultivating direct perception of the Self within the heart. But they can do this only by purifying their mind and senses of all conceptions of material distinctions and all attachment to material sense objects. Only in this way will Your impersonal feature manifest itself to them.

Purport

It is difficult for conditioned souls to understand all the transcendental features of the Supreme Lord. As confirmed in the First Canto of Śrīmad-Bhāgavatam (1.2.11): brahmeti paramātmeti bhagavān iti śabdyate. The transcendental existence of God is understood progressively as the impersonal effulgence, the localized Supersoul in one’s heart, and finally the Supreme Personality of Godhead existing in His eternal abode. Lord Kṛṣṇa’s transcendental existence is beyond the qualities of material nature. Thus here the Lord is referred to as aguṇasya, without material qualities.

Even by practicing yoga or engaging in advanced philosophical speculation, one will find it very difficult to understand clearly the transcendental existence beyond the modes of material nature. And these processes are virtually useless for understanding the Lord’s own unlimited transcendental qualities, which are far beyond the impersonal conception of spiritual existence. Only by the mercy of the pure devotees of the Lord or by associating with the Lord Himself can one begin the process of realizing the personal feature of God — a process that culminates in pure Kṛṣṇa consciousness, the final and supreme perfection of knowledge.