Gunas

Matter consists of two oppositional, energetic, constantly changing states (think Star Wars: the light and dark sides of the Force). While the two states are exact opposites (Yoga refers to them as Rajas and Tamas – other schools as Yin and Yang), there’s a third, stable, steady, quiet, balanced state where the two opposing states are found in equal parts (represented by the dividing line in a Yin/Yang symbol): Sattva.