Sāṃkhya is one of six orthodox philosophies (āstika darśanas) of Hinduism. 1
The other five are Nyāya, Pūrva Mīmāṃsā, Uttara Mīmāṃsā (Vedānta), Vaiśeṣika, and Yoga.
Being the oldest of the six, Sāṃkhya influenced the others. 2
It was originally expounded by the Sage Kapila, sometimes considered the father of Indian philosophy.
In ancient times, there was no division between philosophy and science.
The sages (ṛṣis) simply described reality as they saw it.
They didn’t use microscopes or telescopes as we do today, though.
Instead, they relied on their five senses and intuition.
Moreover, they adhered to a scientific method of experiment, deduction, and corroboration (pratyakṣa, anumāna, and śabda). 3
Thus, Kapila discovered a set of twenty-five principles (tattvas) that describe the fundamental properties of the universe.
Yoga subsequently adopted these principles.
Consequently, Sāṃkhya is the theoretical basis of Yoga. 4
And conversely, Yoga is the practical application of Sāṃkhya.
So, they’re really two sides of the same coin.
Many people associate non-duality (advaita) strictly with Advaita Vedānta.
However, any philosophy can be non-dual, provided that it posits only one absolute reality (pāramārthika satya).
As the theoretical basis of Yoga, Sāṃkhya determines whether Yoga is non-dual.
Historically, Sāṃkhya was dualistic (dvaita) because it posited two absolute realities.
But it was recently recompiled into a non-dual version, which has some exciting connections with modern string theory.
To understand it though, we must first review its predecessor.
Sāṃkhya was originally recorded in the Science of Sixty Topics (Ṣaṣṭitantra), which is no longer extant. 5
Thankfully, it’s survived by the Sāṃkhya Kārikā6 of Īśvarakṛṣṇa.
It contains seventy-two verses (kārikās).
It’s considered an atheistic work because it doesn’t include God (īśvara) 4.
It herein defines “Dual Sāṃkhya” (Dvaita Sāṃkhya).
Dvaita Sāṃkhya presents a dualistic view wherein spirit and nature (puruṣa and prakṛti) are two ultimate yet separate realities. 7
They don’t share a common origin (mūla), nor do they ever resolve into each other.
Spirit is the conscious (cetana) witness.
Nature is the subconscious (jaḍa) actor.
It merely reflects the consciousness of spirit.
In this context, “evolution” refers to the manifestation of a complex existence from a simpler, unmanifest existence.
An evolvent is a cause of evolution; an evolute is an effect of evolution.
In Dvaita Sāṃkhya, spirit isn’t an evolvent.
Instead, all evolution occurs through the three qualities (triguṇa) 7 of nature.
They are purity, passion, and darkness (sattva, rajas, and tamas).
They’re the basic building blocks of all manifestation.
Though, nature is counted as one.
The union (saṃyoga) of spirit and nature produces the creation (sarga) 8.
Consequently, twenty-three principles (tattvas) evolve from nature. 9
Some of which are subsequent evolvents.
First, comes intellect (buddhi).
From it, comes ego (ahaṃkāra).
And from it, come the group of sixteen (ṣoḍaśaka), which includes mind (manas), the ten senses (indriyas), and the five subtle elements (tanmātras).
And from the latter, come the five gross elements (mahāhūtas).
Like nature itself, these twenty-three evolutes are insentient.
Like the Sāṃkhya Kārikā 6, the Advaita Sāṃkhya Sūtras of Sam K. Vyās 10 contain seventy-two aphorisms (sutras).
They herein define “Non-Dual Sāṃkhya” (Advaita Sāṃkhya).
Advaita Sāṃkhya inherits and builds upon the tradition of Kapila using compatible insights from modern science and other ancient philosophies.
It doesn’t blindly assert non-duality, though.
Instead, it shows how all the pieces fit together into one whole.
Like the Yoga philosophy, it includes God (īśvara), which is translated as the “oversoul.”
Advaita Sāṃkhya states that the unqualified source (nirguṇa brahman) is the absolute reality (pāramārthika satya). 11
It has no qualities (guṇas) yet it’s the origin (mūla) of all qualities.
Therefore, it’s beyond description.
The universe (jagat) is merely the vibration (eva the spanda) of the unqualified source. 12
In addition to “quality,” the term “guṇa” also means “string.”
Hence, the qualities can be considered vibrating strings.
Three strings (triguṇa) 13 preexist inside the origin.
They are spirit, nature, and the oversoul (puruṣa, prakṛti, and īśvara).
The oversoul is the union (saṃyoga) of spirit and nature. 14
Spirit and nature are like the positive and negative poles of a magnet.
Consequently, all three together are evolvents.
From these three evolve existence, bliss, consciousness, the soul, mind, emotion, and physics (sat, ānanda, cit, jīva, sattva, rajas, and tamas). 15
Moreover, these seven strings (saptaguṇa) are also evolvents.
Each of them containing a recurring tenfold principle (daśatattva). 16
They include the classical intellect (buddhi or vijñāna) 17, ego (ahaṃkāra) 17, mind (manas) 18, senses (indriyas) 19, subtle elements (tanmātras) 20, and gross elements (mahābhūtas) 21.