The Mimamsa school — the dominant tradition of Vedic hermeneutics in Shankara's day — held that the Veda is primarily a text of injunctions for ritual action, and that the purpose of Vedic study and practice is the correct performance of prescribed duties that earn merit and ultimately liberation. On this view, the Upanishadic passages about Brahman are supplementary — they describe the ultimate goal toward which action is directed but do not replace action as the means. Shankara's entire hermeneutical enterprise in both the Brahmasūtra commentary and the Gita commentary is a sustained refutation of this view: the Upanishads are not supplements to the karma-kanda (ritual section) but a wholly different kind of text, concerned not with injunction but with knowledge, not with what to do but with what is.
Shankara's argument that action cannot produce liberation is structural, not merely traditional. Liberation, he argues, is the cessation of the false identification of the self with what is not the self. This identification is a matter of ignorance — a cognitive error, not a moral failure or a ritual deficiency. The cure for ignorance is knowledge, not action: just as a second lamp does not cure the mistake of seeing a rope as a snake (only better light does), no accumulation of ritual merit can cure the mistake of seeing the self as limited, mortal, and separate. Action can purify the mind, reducing its attachment and agitation, thereby making it a more transparent medium for the recognition of truth. In this preparatory role, action is valuable. But action cannot itself produce the liberating recognition — it can only remove obstacles to it.
Shankara's reading of the Gita is not simply an attack on the value of action but a careful account of its proper place. The first six chapters of the Gita, he argues, address the qualified student who is still attached to action and needs to be guided through the discipline of karma yoga — acting without desire for the fruits, performing duty without ego-investment in the outcome. The middle six chapters introduce jnana and bhakti. The final six return to the synthesis: a person established in the knowledge of non-duality acts in the world without bondage, because the agent-sense that would bind them to action has been dissolved. Such a person neither renounces action nor pursues it; they are simply in the world as they are in themselves — free.
Shankara's hierarchical reading of the Gita — placing jnana above karma and bhakti — was contested by later Vaishnava commentators, above all Ramanuja, who argued that the Gita equally endorses the path of devotion. The debate between Advaita and Vishishtadvaita interpretations of the Gita has continued for nine centuries.
