Knowledge and Reality
I was reading an article in the Wikipedia on Jewish philosophy at http://en.wikipedia.org/wiki/Jewish_philosophy and the section far down the page at:
Traditionalist attitudes towards philosophy
which reads: Haredi traditionalists who emerged in reaction to the Haskalah considered the fusion of religion and philosophy as difficult because classical philosophers start with no preconditions for which conclusions they must reach in their investigation, while classical religious believers have a set of religious principles of faith that they hold one must believe. Most Haredim contended that one cannot simultaneously be a philosopher and a true adherent of a revealed religion.