It often happens, for example, that we underline the interest philosophy has for unanswerable, or as yet unresolved, questions. Such is the perspective shared by positivists, to which the author is opposed.
Philosophy is equally interested in the fact of ignorance itself.
A long tradition of skepticism has also scrutinized this problem. One radical position held that we could never acquire knowledge about what is essential. In its excess, this tradition becomes more a philosophical challenge than a viable platform. There are also the kinds ignorance of which we ourselves are ignorant, but which we may observe by studying the divergences that exist among the thinkers. This is why, when faced with the famous problem of nature and conscience, certain philosophers attest that the problem is resolved, others claim that it is in the process of being resolved, another faction insists that we lack the appropriate concepts to do so while still others judge that the human brain inherently can not know itself.