And the higher by which the Immutable is attained.

The higher knowledge in one phrase: that which leads to realization.

Athā parā — and the higher. Contrast with the extensive list of the lower.

Yayā — by which. The means, the way, the practice.

Tad akṣaram — that Immutable. Brahman, what is not exhausted nor changes.

Adhigamyate — is attained, is realized. Not studied but lived, directly experienced.

The brevity is eloquent: while the lower requires extensive treatises, the higher is ineffable, inexpressible, only realizable.

Parā vidyā is not another text but the knowledge that transcends texts. It is brahma-vidyā: to know Brahman is to be Brahman.

Yoga is this adhigama: not accumulation of information but transformation of being, dissolution of the knot of ignorance.

The rest of the Muṇḍaka is expansion of this single phrase.