ZAA
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[[Madhya-lijā. Ch. 8]
tat-tad-guṇānuśravaṇaṁ mukunda-pādāravindaṁ hrdavesu vesām
“After much hard labor, a person highly learned in Vedic literature is certainly very famous. However, one who is always hearing and chanting the glories of the lotus feet of Mukunda within his heart is certainly superior.”
In the Nārāyana-vyūha-stava, it is said::
nāhaṁ brahmāpi bhūyāsaṁ tvad-bhakti-rahito hare tvayi bhaktas tu kīṭo ‘pi bhūyāsaṁ janma-janmasu
“I do not aspire to take birth as a Brahmā if that Brahmā is not a devotee of the Lord. I shall be satisfied simply to take birth as an insect if I am given a chance to remain in the house of a devotee.”
There are many similar verses in  Śrīmad-Bhāgavatam , especially 3.25.38, 4.24.29, 4.31.22, 7.9.24, and 10.14.30.
It was Lord Śiva who said: “I do not know the truth about Kṛṣṇa, but a devotee of Lord Kṛṣṇa’s knows all the truth. Out of all the devotees of Lord Kṛṣṇa, Prahlāda is the greatest.”
Above Prahlāda, the Pāṇḍavas are supposedly more advanced. Above the Pāṇḍavas are the members of the Yadu dynasty, who are even more advanced. In the Yadu dynasty, Uddhava is the furthest advanced, and above Uddhava are the damsels of Vraja-dhāma, the  gopīs  themselves.
In the  Bțhad-vāmana Purāṇa , Bhrgu is told by Lord Brahmā::
şaşṭi-varşa-sahasrāṇi
mayā taptaṁ tapaḥ purā
nanda-gopa-vraja-strīṇāṁ
pāda-reṇūpalabdhaye
“I underwent meditation and austerities for 60,000 years just to understand the dust of the lotus feet of the  gopīs . Still, I could not understand them. To say nothing of me, even Lord Śiva, Lord Śeṣa and the goddess of fortune Lakṣmī could not understand them.”
In the  Ādi Purāṇa  the Supreme Personality of Godhead Himself says::
na tathā me priyatamo brahmā rudraś ca pārthiva na ca lakṣmīr na cātmā ca yathā gopī-jano mama