The constancy by which one does not abandon sleep, fear, sorrow, depression and pride — that constancy is tāmasic, oh Pārtha.

Tāmasic constancy: clings to the negative. Svapna — sleep, dullness, fantasy. Bhaya — fear. Śoka — sorrow. Viṣāda — depression. Mada — pride, intoxication.

Durmedhā — of poor intelligence. Cannot let go of these states, identifies with them. It is obstinacy in darkness.