When tamas takes over, everything dims. Clarity disappears, motivation vanishes, mistakes multiply, and confusion clouds the mind. These four symptoms — darkness, inactivity, carelessness, and delusion — are tamas showing its hand.
It is the feeling of staring at a page for ten minutes without absorbing a single word. The task is right there, the body is right here, but a wall of fog stands between them. Mistakes happen not from effort gone wrong but from effort never made. That is the signature of tamas.
Notice the precision of Krishna's language. "Aprakasha" is the opposite of sattva's light. "Apravritti" is the opposite of rajas's activity. Tamas negates both of the other gunas at once. Where sattva illuminates and rajas energizes, tamas dims and stalls.