When there is an increase in the mode of ignorance, O son of Kuru, darkness, inertia, madness and illusion are manifested.
Author Name:-Sri Ramanuja
Purport
Sri Ramanuja
14.13 ‘Non-illumination’ is the absence of knowledge. ‘Inactivity’ is immovableness. ‘Negligence’ is inadvertence resulting in works that should not be done. ‘Delusion’ is wrong knowledge. These arise when Tamas waxes strong. By these, one should know that the Tamas has increased very much.
Author Name:-Sri Adi Shankaracharya
Purport
Sri Adi Shankaracharya
14.13 Kuru-nandana, O descendant of the Kuru dynasty; when the quality of tamas vivrddhe, predominates; etani, these indications; eva, surely; jayante, come into being; extreme aprakasah, non-discrimination; and apravrttih, inactivity; its [i.e. of non-discrimination.] effects, pramadah, in-advertence; and mohah, delusion, i.e. stupidity, which is a from of non-discrimination. Whatever result is achieved even after death, that is also owing to attachment and desire; every-thing is certainly caused by the qualities. By way of showing this the Lord says: