(note 1) The entire verse is this: מה השם אלהיך שואל ממך כי עם אהבת חסד ועשות משפט והצנע לכת עם אלהיך.
However the basic question remains for oneself: how to discern between good and evil, right and wrong, in the same area of value?
What are the minimum or maximum requirements of the Torah. Clearly the fanatic religious world is off on some lunatic LSD trip, but still that leaves the question open. The fact that many do Torah wrong does not tell me how to do it right. The best approach in my opinion is that of the Rambam who at least stated clearly his four fold approach of learning the Written and Oral Torah [the two Talmuds,] the Physics and Metaphysics of Aristotle. This seems to be close to the path of my parents. Most other paths I have seen as producing really evil people is religious disguise.
There is nothing wrong with intensity of devotion if one is on a basically good path. For example, let's say that one is in a straight Lithuanian kind of yeshiva that goes strictly by the path of the Gra. In that case there would be nothing wrong with being a fanatic. Being fanatic is learning + keeping Torah is a good thing. There are dangers there also, but still the idea is once one is on a good path, one must stick with it and not leave--even for other paths which seem to be good.