Devibhagavatapurana 7.37.38

7.37.38

anekajanmabhī rājaṃjñānaṃ syānnaikajanmanā |
tataḥ sarvaprayatnena jñānārthaṃ yatnamāśrayet ||

O King of Mountains! This Jñâna arises after many births it does not come in one birth; so one should try one's best to get this Jñâna. If, attaining this rare human birth, one does not attain this Jñâna, know that a great calamity has befallen to him. For this human birth is very hard to attain; and then the birth in a Brâhmin family is rarer; moreover amongst the Brâhmins, the knowledge of the Veda (the Consciousness is exceedingly rare.) The attaining of the six qualities (which are considered as six wealth), restraint of passions, etc.; the success in Yoga and the acquisition of a pure real Guru, all these are very hard to be attained in this life. O Mountain! The maturity and the activities of the organs of the senses, and the purification of the body according to the Vedic rites are all very difficult to attain. Know this again that to get a desire for final liberation is acquired by the merits acquired in many births. That man's birth is entirely futile, who attaining all the above qualifications does not try his best to attain this Jñâna, So one should try one's best to acquire the Jñâna. Then, at every moment, he gets the fruits of the As'vamedha sacrifice. There is no doubt in this. As ghee (clarified butter) resides potentially in milk, so the Vijñâna Brahma resides in every body. So make the mind the churning rod and always churn with it. Then, by slow degrees, the knowledge of Brahma will be attained.
Man attains blessedness when he gets this Jñâna; so the Vedânta says: Thus I have described to you in brief, O King of Mountains! all that you wanted to hear. Now what more do you want?
Here ends the Thirty-seventh Chapter of the Seventh Book on the glories of Bhakti in the Mahâ Purânam, S'ri Mad Devî Bhâgavatam, of 18,000 Verses, by Maharsi Veda Vyâsa.