... a big fat book.

The only serious global social movement, in all of history to date, has been the international labor movement (Marxism), which had one great, enduring, and legitimate strength—and one altogether fatal weakness. The strength was that it discovered a common trait that all humans possess, regardless of race, creed, nationality, or gender: we all have to secure our bodily survival through social labor of one sort or another. We all have to eat. And thus social labor puts us all in the same boat, makes us all world citizens.

Its fatal weakness was that it did not just ground higher cultural endeavors in the economic or material realm, it reduced them to that exchange, reduced them to material productions and material values and material means, with all higher productions, especially spirituality, serving only as the opiate of the masses.

This was such an egregious reduction that Marxism had to be converted into a religious mythology, and had to press its vision in an imperialistic fashion. But it took evolution less than a mere century to begin to erase that mistake in earnest.

—Ken Wilber, 199-200, Sex, Ecology, Spirituality, 2000.