Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 38


तपसा विद्यया पक्‍वकषायो नियमैर्यमै: ।युयुजे ब्रह्मण्यात्मानं विजिताक्षानिलाशय: ॥ ३८ ॥


tapasā vidyayā pakva-kaṣāyo niyamair yamaiḥyuyuje brahmaṇy ātmānaṁvijitākṣānilāśayaḥ


By worshiping, executing austerities and following the regulative principles, King Malayadhvaja conquered his senses, his life and his consciousness. Thus he fixed everything on the central point of the Supreme Brahman [Kṛṣṇa].


Whenever the word brahman appears, the impersonalists take this to mean the impersonal effulgence, the brahmajyoti. Actually, however, Parabrahman, the Supreme Brahman, is Kṛṣṇa, Vāsudeva. As stated in Bhagavad-gītā (7.19), vāsudevaḥ sarvam iti: Vāsudeva extends everywhere as the impersonal Brahman. One cannot fix one’s mind upon an impersonal “something.” Bhagavad-gītā (12.5) therefore says, kleśo ’dhikataras teṣām avyaktāsakta-cetasām: “For those whose minds are attached to the unmanifested, impersonal feature of the Supreme, advancement is very troublesome.” Consequently, when it is said herein that King Malayadhvaja fixed his mind on Brahman, “Brahman” means the Supreme Personality of Godhead, Vāsudeva.