'darkness') is one of the three guṇas (tendencies, qualities, attributes), a philosophical and psychological concept developed by the Samkhya school of Hindu philosophy.
This category of qualities have been widely adopted by various schools of Hinduism for categorizing behavior and natural phenomena.
The three qualities are: Action that is virtuous, thought through, free from attachment, and without craving for results is considered Sattvic.
Action that is undertaken because of delusion, disregarding consequences, without considering loss or injury to others or self, is called Tamasic.
— Bhagavad Gita, Chapter 18, verses 23–25 [31] In Indian philosophy, these qualities are not considered as present in either-or fashion.