90
Śrīmad-Bhāgavatam
[Canto 7, Ch. 7]
ālambham —being constantly in contact;  iha —in this material world;  aśubha-ātmanaḥ —whose mind is materially contaminated;  śarīrīṇaḥ —of a living entity who has accepted a material body;  saṁsṛti —of material existence;  cakra —the cycle;  śātanam —completely stopping;  tat —that;  brahma-nirvāṇa —connected with the Supreme Brahman, the Absolute Truth;  sukham —transcendental happiness;  viduḥ —understand;  budhāḥ —those who are spiritually advanced;  tataḥ —therefore;  bhajadhvam —engage in devotional service;  hṛdaye —within the core of the heart;  hṛt-īśvaram —to the Supreme Personality of Godhead, the Supersoul within the heart.
TRANSLATION
The real problem of life is the repetition of birth and death, which is like a wheel rolling repeatedly up and down. This wheel, however, completely stops when one is in touch with the Supreme Personality of Godhead. In other words, by the transcendental bliss realized from constant engagement in devotional service, one is completely liberated from material existence. All learned men know this. Therefore, my dear friends, O sons of the asuras, immediately begin meditating upon and worshiping the Supersoul within everyone's heart.
PURPORT
Generally it is understood that by merging into the existence of Brahman, the impersonal feature of the Absolute Truth, one becomes completely happy. The words  brahma-nirvāṇa  refer to connecting with the Absolute Truth, who is realized in three features:  brahmeti paramātmeti bhagavān iti śabdyate . One feels  brahma-sukha , spiritual happiness, by merging into the impersonal Brahman because the  brahmajyoti  is the effulgence of the Supreme Personality of Godhead.  Yasya prabhā prabhavato jagad-aṇḍa-koṭi .  Yasya prabhā , the impersonal Brahman, consists of the rays of Kṛṣṇa's transcendental body. Therefore whatever transcendental bliss one feels from merging in Brahman is due to contact with Kṛṣṇa. Contact with Kṛṣṇa is perfect  brahma-sukha . When the mind is in touch with the impersonal Brahman one becomes satisfied, but one must advance further to render service to the Supreme Personality