There are several treaties on the nature of faith in rabbinic law. The case of Job is often exemplified as a case of "true" faith as opposed to faith not for faith sake.

The true faith, does not seek reward for good behavior, nor bothers trying to understand the divine will, it simply accepts the Yoke of the heavens. in the case of Job.

He does not ponder the reason, it is all the same to him "...the Lord gave, and the Lord hath taken away..."