Srimad Bhagavatam Canto 08, Chapter 12, Text 10

SB 8.12.10

naham parayur rsayo na marici-mukhya
 jananti yad-viracitam khalu sattva-sargah
yan-mayaya musita-cetasa isa daitya-
 martyadayah kim uta sasvad-abhadra-vrttah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
O my Lord, I, who am considered to be the best of the demigods, and Lord Brahma and the great rsis, headed by Marici, are born of the mode of goodness. Nonetheless, we are bewildered by Your illusory energy and cannot understand what this creation is. Aside from us, what is to be said of others, like the demons and human beings, who are in the base modes of material nature [rajo-guna and tamo-guna]? How will they know You?
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
Factually speaking, even those who are situated in the material mode of goodness cannot understand the position of the Supreme Personality of Godhead. What then is to be said of those who are situated in rajo-guna and tamo-guna, the base qualities of material nature? How can we even imagine the Supreme Personality of Godhead? There are so many philosophers trying to understand the Absolute Truth, but since they are situated in the base qualities of material nature and are addicted to so many bad habits, like drinking, meat-eating, illicit sex and gambling, how can they conceive of the Supreme Personality of Godhead? For them it is impossible. For the present day, the pañcaratriki-vidhi as enunciated by Narada Muni is the only hope. Srila Rupa Gosvami, therefore, has quoted the following verse from the Brahma-yamala:
 pañcaratra-vidhim vina
aikantiki harer bhaktir
 utpatayaiva kalpate
“Devotional service of the Lord that ignores the authorized Vedic literatures like the Upanisads, Puranas and Narada-pañcaratra is simply an unnecessary disturbance in society.” (Bhakti-rasamrta-sindhu 1.2.101) Those who are very advanced in knowledge and are situated in the mode of goodness follow the Vedic instructions of the sruti and smrti and other religious scriptures, including the pañcaratriki-vidhi. Without understanding the Supreme Personality of Godhead in this way, one only creates a disturbance. In this Age of Kali, so many gurus have sprung up, and because they do not refer to the sruti-smrti-puranadi-pañcaratrika-vidhi, they are creating a great disturbance in the world in regard to understanding the Absolute Truth. However, those who follow the pañcaratriki-vidhi under the guidance of a proper spiritual master can understand the Absolute Truth. It is said, pañcaratrasya krtsnasya vakta tu bhagavan svayam: the pañcaratra system is spoken by the Supreme Personality of Godhead, just like Bhagavad-gita. Vasudeva-sarana vidur añjasaiva: the truth can be understood only by one who has taken shelter of the lotus feet of Vasudeva.
bahunam janmanam ante
 jñanavan mam prapadyate
vasudevah sarvam iti
 sa mahatma sudurlabhah
“After many births and deaths, he who is actually in knowledge surrenders unto Me, knowing Me to be the cause of all causes and all that is. Such a great soul is very rare.” (Bg. 7.19) Only those who have surrendered to the lotus feet of Vasudeva can understand the Absolute Truth.
vasudeve bhagavati
 bhakti-yogah prayojitah
janayaty asu vairagyam
 jñanam ca yad ahaitukam
“By rendering devotional service unto the Personality of Godhead, Sri Krsna, one immediately acquires causeless knowledge and detachment from the world.” (Bhag. 1.2.7) Therefore, Vasudeva, Bhagavan Sri Krsna, personally teaches in Bhagavad-gita:
sarva-dharman parityajya
 mam ekam saranam vraja
“Abandon all varieties of religion and just surrender unto Me.” (Bg. 18.66)
bhaktya mam abhijanati
 yavan yas casmi tattvatah
“One can understand the Supreme Personality as He is only by devotional service.” (Bg. 18.55) The Supreme Personality of Godhead is not properly understood even by Lord Siva or Lord Brahma, what to speak of others, but He can be understood by the process of bhakti-yoga.
mayy asakta-manah partha
 yogam yuñjan mad-asrayah
asamsayam samagram mam
 yatha jñasyasi tac chrnu
(Bg. 9.7)
If one practices bhakti-yoga by taking shelter of Vasudeva, Krsna, simply by hearing Vasudeva speak about Himself, one can understand everything about Him. Indeed, one can understand Him completely (samagram).
Srimad Bhagavatam Canto 08, Chapter 12, Text 09
Srimad Bhagavatam Canto 08, Chapter 12, Text 11