At the end of the day, the history and philosophy of the city of man (especially when the whole of it stretched across the earth is considered) only lead to contradiction and error. We believers alone have truth and reality on our side, and can rest assured in the object of our faith as expressed in Scripture.
Philosophy, like history, has done the city of man no good--despite the occasional glimmerings of truth it discovers. Philosophers themselves can rarely get above human reason, and are almost always driven by pride and vainglory. This is opposed to the authors of Scripture, among whom "there is no shadow of disagreement," despite the wide variety of men involved in its writing.
Not that it matters much to the city of man--they can't even agree on a philosophy and just accept everything pell-mell. Which, given the transcendent import of the subject matter of philosophy (human happiness) shows further the depravity of man--would any state ever accept such a course in such "relatively indifferent matters as agriculture, architecture, or economics"?
Again, this is not to say that there is no truth in the city of man: "Certain philosophers, it is true, did get a glimpse of the truth amid the fog of their own fallacies and did try to build it up to solid conviction and persuasiveness by means of carefully worked-out argumentation."
Yet for all that, philosophy does not carry the authority or power of Scripture, which when declared brings men to repentance and faith.