How can knowledge alone free us from karmic bondage, as Gita 4.14 says?

From Ankur Sharma Prabhu
Srila Prabhupada says in the purport of verse 4.14, “Anyone who is fully conversant with all the intricacies of this law of karma, or fruitive activities, does not become affected by the results of his activities.” Similarly thing is said in 4.9.
How can simply knowing something free one from the bondage of karma?

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