All the different branches of Indian philosophy are indebted to the Samkhya system for its in-depth analysis. This is the authoritative text on Samkhya. Sanskrit Text, word by word meaning, and commentary.
Learning and wisdom are superfluities, the surface glitter merely, but it is the heart that is the seat of all power. It is not in the brain but in the heart that the Atman, possessed of knowledge, power, and activity, has its seat.
-Swami Vivekananda