Srimad Bhagavatam Canto 10, Chapter 87, Text 49

SB 10.87.49

ity etad varnitam rajan
 yan nah prasnah krtas tvaya
yatha brahmany anirdesye
 nirgune ’pi manas caret
 
Translation: 
 
Thus I have replied to the question you asked me, O King, concerning how the mind can have access to the Absolute Truth, which is indescribable by material words and devoid of material qualities.
Srimad Bhagavatam Canto 10, Chapter 87, Text 48
Srimad Bhagavatam Canto 10, Chapter 87, Text 50