Sankhya, one of the six traditional schools of Indian philosophy. In Sankhya, the phenomenal world of mind and matter is described as having three basic qualities or gunas: sattva– goodness, light, purity; rajas– passion, activity, energy; and tamas– darkness, ignorance, inertia. According to Sankhya, spiritual evolution progresses from tamas to rajas to sattva, and final liberation takes the soul beyond the three gunas altogether.