In which case, for the benefit of a still petty-bourgeois and semi-feudal society, it can either be reduced to the level of such a society simply through judicial practice (common law) or, with the help of allegedly enlightened, moralizing jurists it can be worked into a special code of law to correspond with such social level -- a code which in these circumstances will be a bad one also from the legal standpoint (for instance, Prussian Landrecht).
But after a great bourgeois revolution it is, however, also possible for such a classic law code of bourgeois society as the French Code Civile to be worked out upon the basis of this same Roman Law. If, therefore, bourgeois legal rules merely express the economic life conditions of society in legal form, then they can do so well or ill according to circumstances.
The state presents itself to us as the first ideological power over man. Society creates for itself an organ for the safeguarding of its common interests against internal and external attacks. This organ is the state power. Hardly come into being, this organ makes itself independent vis-a-vis society; and, indeed, the more so, the more it becomes the organ of a particular class, the more it directly enforces the supremacy of that class. The fight of the oppressed class against the ruling class becomes necessarily a political fight, a fight first of all against the political dominance of this class. The consciousness of the interconnection between this political struggle and its economic basis becomes dulled and can be lost altogether. While this is not wholly the case with the participants, it almost always happens with the historians. Of the ancient sources on the struggles within the Roman Republic, only Appian tells us clearly and distinctly what was at issue in the last resort -- namely, landed property.
But once the state has become an independent power vis-a-vis society, it produces forthwith a further ideology. It is indeed among professional politicians, theorists of public law, and jurists of private law, that the connection with economic facts gets lost for fair. Since in each particular case, the economic facts must assume the form of juristic motives in order to receive legal sanction; and since, in so doing, consideration of course has to be given to the whole legal system already in operation, the juristic form is, in consequence, made everything and the economic content nothing.
Public law and private law are treated as independent spheres, each being capable of and needing a systematic presentation by the consistent elimination of all inner contradictions.
Still higher ideologies, that is, such as are still further removed from the material, economic basis, take the form of philosophy and religion.
Here the interconnection between conceptions and their material conditions of existence becomes more and more complicated, more and more obscured by intermediate links. But the interconnection exists. Just as the whole Renaissance period, from the middle of the 15th century, was an essential product of the towns and, therefore, of the burghers, so also was the subsequently newly-awakened philosophy. Its content was in essence only the philosophical expression of the thoughts corresponding to the development of the small and middle burghers into a big bourgeoisie. Among last century's Englishmen and Frenchmen who in many cases were just as much political economists as philosophers, this is clearly evident; and we have proved it above in regard to the Hegelian school.