The bourgeoisie, which far surpasses the proletariat in the completeness and irreconcilibility of its class consciousness, is vitally interested in imposing its moral philosophy upon the exploited masses. It is exactly for this purpose that the concrete norms of the bourgeois catechism are concealed under moral abstractions.. The appeal to abstract norms is not a disinterested philosophic mistake but a necessary element in the mechanics of class deception.
Lenin refused to recognise moral norms established by slave-owners for their slaves and never observed by the slave-owners themselves; he called upon the Proletariat to extend the class struggle into the moral sphere too. Who fawns before the precepts established by the enemy will never vanquish that enemy!