Bourgeois society is ruled by equivalence. It makes the dissimilar comparable by reducing it to abstract quantities. To the Enlightenment, that which… - Max Horkheimer

In the subjectivist view, when ‘reason’ is used to connote a thing or idea rather than an act, it refers exclusively to the relation of such an object or concept to a purpose, not to the object or concept itself. It means that the thing or the idea is good for something else. There is no reasonable aim as such, and to discuss the superiority of one aim over another in terms of reason becomes meaningless. From the subjective approach, such a discussion is possible only if both aims serve a third and higher one, that is, if they are means, not ends.

At present, when the prevailing forms of society have become hindrances to the free expression of human powers, it is precisely the abstract branches of science, mathematics and theoretical physics, which … offer a less distorted form of knowledge than other branches of science which are interwoven with the pattern of daily life, and the practicality of which seemingly testifies to their realistic character.

The quality of the human that precludes identifying the individual with the class is ‘metaphysical’ and has no place in empiricist epistemology. The pigeon hole into which a man is shoved circumscribes his fate.