Sattwan, Rajas, and Tamas, so are named
Krishna expounds the three gunas that constitute material nature: sattva (goodness, illumination), rajas (passion, restless activity), and tamas (darkness, inertia). Every being is bound by these three forces. Liberation comes from transcending all three — rising above even sattva to pure consciousness.
The foundational doctrine of the three gunas (qualities) that govern all of nature and human psychology.