Division of firmness according the threee gunas
29. Hear thou the threefold division of the intellect and firmness
according to the Gunas, as I declare them fully and distinctly, O Arjuna!
33. The unwavering firmness by which, through Yoga, the functions of the mind, the life-force and the senses are restrained—that firmness, O Arjuna, is Sattvic!.
34. But that firmness, O Arjuna, by which, on account of attachment and desire for reward, one holds fast to Dharma, enjoyment of pleasures and earning of wealth—that firmness, O Arjuna, is Rajasic!
35. That by which a stupid man does not abandon
sleep, fear, grief, despair and also conceit—that firmness, O Arjuna, is
Tamasic!
By Swami Sivananda