18.35 That Dhrti by which a foolish person does not give up, i.e. persists in, sleep, and sensuous indulgence through the activities of the mind, vital force etc., - that Dhrti is of the nature of Tamas. The terms fear, grief and depression indicate the objects generating fear, grief etc. That Dhrti by which one maintains the activities of the mind, the vital force etc., as a means for these, is of the nature of Tamas.