Mahat

When prakriti's equilibrium is disturbed and evolution begins, the very first thing to appear is not a sense organ, an element, or anything recognisably physical. It is mahat, sometimes called the great principle, and considered from the standpoint of an individual rather than the cosmos as a whole, it is buddhi, intellect. This ordering is one of Samkhya's more distinctive commitments: the capacity for discernment precedes, both logically and in the sequence of evolution, the organs that will eventually do any sensing or acting, and the objects those organs will eventually sense or act upon.

Mahat is described as predominantly sattvic, the clearest and most luminous of the twenty-three evolutes, which is why it is capable of buddhi, the specific cognitive function of discriminating one thing from another and settling on a determination. Ordinary perception, in the classical model, passes through buddhi at its final stage: the senses gather raw data, manas coordinates it into a single presented object, ahamkara claims it as belonging to a self, and buddhi renders the actual judgment, "this is that." Buddhi is also, distinctively, the tattva capable of the highest judgment the system cares about, discriminating purusha from prakriti itself, which is why liberation is described as an event in buddhi rather than in purusha, even though purusha is the one who benefits from it.

Everything downstream of mahat, in the classical order, from ahamkara through the eleven organs and five subtle elements to the five gross elements, is buddhi's effect rather than its cause, making it the hinge on which the entire perceptible world turns.

Samkhya assigns buddhi a specific list of functions distinct from what mind, ego or the senses do, and the classical texts are precise about the division of labour, because the whole soteriology depends on buddhi being the tattva where the decisive recognition occurs. Where manas merely coordinates sense data into a single presented object and ahamkara claims that object for a self, buddhi is what actually decides: this is a snake, or this is a rope; this experience belongs to prakriti, or purusha was never actually its owner.

The Samkhyakarika lists eight dispositions of buddhi, virtue and vice, knowledge and ignorance, dispassion and attachment, and power and weakness, four of them sattvic and four tamasic, which between them determine whether a given buddhi tends toward bondage or toward liberation. Knowledge here means specifically the discriminative knowledge that purusha and prakriti are distinct, and it is this disposition, cultivated to completion, that ends the mistaken identification driving apparent bondage. Because buddhi is prakriti and not purusha, this whole drama of ignorance and insight takes place entirely on prakriti's side of the ledger; purusha, again, does nothing and is not actually altered by any of it.

Buddhi's priority in the evolutionary sequence, ahead of ahamkara and everything ahamkara produces, is therefore not incidental ordering. It reflects the system's claim that discernment is more fundamental than either the sense of self or the objects a self experiences, and that liberation is available in principle to buddhi in every embodied stream of experience, because buddhi is what every embodied stream of experience already has.