What does the Gita say about the three gunas?

In chapter 14, Guna Traya Vibhaga Yoga, Krishna tells Arjuna that three gunas — qualities born of material nature — bind the otherwise-free soul to the body: sattva, rajas, and tamas (BG 14.5). Sattva is purity and light; being stainless, it binds a person through attachment to happiness and to knowledge itself (14.6). Rajas is passion, born of craving and attachment, and it binds the embodied soul through attachment to action — it keeps a person restlessly busy and dissatisfied (14.7). Tamas, born of ignorance, deludes every embodied being and binds through negligence, laziness, and sleep, clouding judgment entirely (14.8). Krishna is clear that these three gunas are always mixed and competing for dominance in every person, each temporarily overpowering the other two (14.10), and each produces a recognizable effect: sattva's rise shows as the light of knowledge, rajas's rise shows as greed and restless activity, tamas's rise shows as darkness, delusion, and inertia (14.11–13). Where the Gita departs from simply cataloguing these qualities is its instruction to transcend all three rather than just cultivate sattva over the others. Arjuna asks directly what marks someone who has gone beyond the gunas (14.21), and Krishna answers that such a person remains unmoved whether illumination, activity, or delusion arises or fades, neither craving nor averse to any of the three, seated as a neutral witness who knows it is only the gunas acting and not the true self (14.22–23). This is a subtler goal than moral improvement: sattva is still a binding quality, just a pleasant one, and the Gita's endpoint is standing apart from the entire mechanism of nature's qualities, not simply maximizing the best one.