Madhvaon Brahma Sūtra 3.3.49

Emphatic and strong is the Sruti: “ The king Indra having performed a hundred Asvamedha sacrifices betook himself to the praiseworthy Brahma and reverentially said, “Neither by means of Karma (pious acts) nor by wealth nor by other means I find happiness; therefore be pleased to instruct me as to what is true.” The indication contained herein is very strong (decisive). A reason also is furnished by the text, “ (Heaven) that which is not made cannot be obtained by action (which is of course productive of limited consequences) ” (Ath. I. 2). “ The being (soul) is subject to bondage on account of Karma, and by knowledge obtains release; hence the sages that have conquered their passions and seen the perfect Being, do not perform (the sacrificial) acts, etc.” And this statement of the glorious Krishna is full of justification; hence no conflict with other authorities. In the Gita text quoted in the beginning, viz., “ By Karma only, etc.,” the emphatic particle ‘only' has the force of excluding the absence of other means. [That is, it has to be construed with the predicate. Then the meaning of the passage is (1) Janaka, etc., only by performing Karma (also), attained the Highest Good, (2) Janaka, etc., who were performing Karma (also), did attain the Highest Good].