Why would a non-dualist mind choose the Bodhisattva path once it has stopped differentiating between suffering and non-suffering?

As I understand from what contact I've had with Mahayanist explanations, a prominent feature of the enlightened mind is that it no longer splits the world into "X and non-X" categories but sees it all as a single harmonious continuum. But that would mean the same mind would also no longer split human experience into "suffering and non-suffering". What motivation, then, to follow the Bodhisattva path of helping all beings escape "suffering", if "suffering" is no longer distinguished? Or is it the case that Mahayana never said enlightenment *guarantees* that a Buddha will take this path, and therefore that Mahayana *does not* guarantee you will come out a moral person once you have followed the path to its end?