Srimad Bhagavatam Canto 11, Chapter 21, Text 20

SB 11.21.20

kaler durvisahah krodhas
 tamas tam anuvartate
tamasa grasyate pumsas
 cetana vyapini drutam
 
Translation: 
 
From quarrel arises intolerable anger, followed by the darkness of ignorance. This ignorance quickly overtakes a man’s broad intelligence.
 
Purport: 
 
The desire for material association arises from one’s propensity to deny that everything is God’s energy. Falsely imagining material sense objects to be separate from the Supreme Lord, one desires to enjoy them; such desire gives rise to conflict and quarrel in human society. This conflict inevitably gives rise to great anger, which makes human beings become foolish and destructive. Thus the actual goal of human life is quickly forgotten.
Srimad Bhagavatam Canto 11, Chapter 21, Text 19
Srimad Bhagavatam Canto 11, Chapter 21, Text 21