All things in nature become identical with the phenomena they present when submitted to the practices of our laboratories, whose problems no less tha… - Max Horkheimer

The disparagement of empirical evidence in favor of a metaphysical world of illusion has its origin in the conflict between the emancipated individual of bourgeois society and his fate within that society.

Every philosophical, ethical, and political idea—its lifeline connecting it with its historical origins having been severed—has a tendency to become the nucleus of a new mythology, and this is one of the reasons why the advance of enlightenment tends at certain points to revert to superstition and paranoia. The majority principle … has become the sovereign force to which thought must cater. It is a new god, not in the sense in which the heralds of the great revolutions conceived it, namely, as a power of resistance to existing injustice, but as a power of resistance to anything that does not conform.

Bourgeois society is ruled by equivalence. It makes the dissimilar comparable by reducing it to abstract quantities. To the Enlightenment, that which does not reduce to numbers, and ultimately to the one, becomes illusion.