"The Samkhya system is associated with the name of the ancient sage Kapila. The basic contention of Samkhya is that the world evolves out of Prakriti through the interplay of gunas. Prakriti is constituted by three gunas – Sattva, Rejas and Tamas. Sattva is the quality of serenity or repose. Rajas stands for activity or movement. Tamas is inertia."