philosophy
What is Samkhya philosophy, and how does it explain the universe through purusha and prakriti?
What the tradition says
Samkhya holds that reality rests on two basic things that always exist. One is purusha, which means pure consciousness or the witness. The other is prakriti, the root matter from which all forms grow. Purusha does not act or change. It only sees. Prakriti is active and constantly changing, and from it comes everything in the world, including the mind and the body. The tradition counts twenty-five tattvas, or basic principles, that make up existence. Purusha and prakriti are two of them, and the rest are seen as products of prakriti as it unfolds into mind, senses, and the physical world.
How it explains the universe
In Samkhya, prakriti is made of three qualities, called gunas: sattva, balance and light; rajas, movement and energy; tamas, weight and rest. When these three sit in balance, prakriti is still. When they fall out of balance, the world begins to take shape, step by step. The mind, the sense of self, the senses, and the elements all come out of this unfolding. Purusha, meanwhile, stays apart and unchanging. A common image is that prakriti dances while purusha watches. The two are often compared to seeing and doing, brought together so that experience can happen.
Where it comes from
The clearest old statement of Samkhya is the Samkhya Karika of Ishvarakrishna, a short text that lays out the system in compact verses. Samkhya is counted among the classic schools of Indian philosophy. Its ideas also flow into the Bhagavad Gita, which uses Samkhya terms when it speaks about the gunas, the field of the body, and the witness who watches it. Many scholars note that early Samkhya did not focus on a creator god, and that other schools later read it in their own ways. The exact early history is debated.
Why it still matters
Samkhya gave later thought a shared vocabulary. Words like purusha, prakriti, and the three gunas appear across yoga, the Gita, and Ayurvedic tradition. People today often meet these ideas without studying Samkhya directly. The split between a quiet witness and a busy, changing world still appeals to many who read it as a way to step back and observe their own thoughts.