। ॥ ९१ ॥
In plain words
The wise name one root cause of freedom, and only one: a fierce dispassion born of seeing clearly what is real and what is not. So if discrimination has woken in you and you want to be free, produce that dispassion first — and produce it by effort.
Close to the Sanskrit
Intense dispassion born of discrimination alone the wise declare to be the root cause of liberation; therefore the discriminating seeker of liberation should first, by effort, bring that dispassion about.