Srimad Bhagavatam Canto 08, Chapter 03, Text 10

SB 8.3.10

nama atma-pradipaya
 saksine paramatmane
namo giram viduraya
 manasas cetasam api
 
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
I offer my respectful obeisances unto the Supreme Personality of Godhead, the self-effulgent Supersoul, who is the witness in everyone’s heart, who enlightens the individual soul and who cannot be reached by exercises of the mind, words or consciousness.
 
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
 
The Supreme Personality of Godhead, Krsna, cannot be understood by the individual soul through mental, physical or intellectual exercises. It is by the grace of the Supreme Personality of Godhead that the individual soul is enlightened. Therefore, the Lord is described here as atma-pradipa. The Lord is like the sun, which illuminates everything and cannot be illuminated by anyone. Therefore, if one is serious about understanding the Supreme, one must receive enlightenment from Him, as instructed in Bhagavad-gita. One cannot understand the Supreme Personality of Godhead by one’s mental, physical or intellectual powers.
Srimad Bhagavatam Canto 08, Chapter 03, Text 08-09
Srimad Bhagavatam Canto 08, Chapter 03, Text 11