Bhagavad Gita Chapter 16 Verse 9
भगवद् गीता अध्याय 16 श्लोक 9

एतां दृष्टिमवष्टभ्य नष्टात्मानोऽल्पबुद्धयः।
प्रभवन्त्युग्रकर्माणः क्षयाय जगतोऽहिताः।।16.9।।



हिंदी अनुवाद - स्वामी रामसुख दास जी ( भगवद् गीता 16.9)
।।16.9।।उपर्युक्त (नास्तिक) दृष्टिका आश्रय लेनेवाले जो मनुष्य अपने नित्य स्वरूपको नहीं मानते? जिनकी बुद्धि तुच्छ है? जो उग्रकर्मा और संसारके शत्रु हैं? उन मनुष्योंकी सामर्थ्यका उपयोग जगत्का नाश करनेके लिये ही होता है।


Rudra Vaishnava Sampradaya - Commentary

Lord Krishna explains  that  the  perceptions  of  the  demoniac  stem  from
exceedingly   impure  minds  and  deranged  intellects  that  are  extremely
limited and so materialistically orientated  that  they  are  only  able  to
accept and believe what they  can   directly  perceive  by  their  mind  and
senses. They incorrigibly perform heinous and horrible deeds  that  lead  to
the degradation and destruction of all creation.


Brahma Vaishnava Sampradaya - Commentary



Shri Vaishnava Sampradaya - Commentary

Continuing further Lord Krishna gives some precise insights to the  demoniac
mentality.
1) Avastabhya means indiscriminately adopting erroneously as in the verse
before.
2) Nasta-atmanah means devoid of any contact with their immortal soul. 
3) Alpa-buddhaya means limited intellect due to being incognizant of  the
cognizant.
4) Ugra-karmanah means vile, heinous, horrendous  activities  destructive
to all.

Such  creatures  are  demoniac  and  are   a   parasitic,   virulent   virus
destabilising all creation.


Kumara Vaishnava Sampradaya - Commentary
Continuing further Lord Krishna gives some precise insights to the  demoniac
mentality.
1) Avastabhya means indiscriminately adopting erroneously as in the verse
before.
2) Nasta-atmanah means devoid of any contact with their immortal soul. 
3) Alpa-buddhaya means limited intellect due to being incognizant of  the
cognizant.
4) Ugra-karmanah means vile, heinous, horrendous  activities  destructive
to all.

Such  creatures  are  demoniac  and  are   a   parasitic,   virulent   virus
destabilising all creation.