Mises tosses off an insight that shakes up everything. Here is the mic-drop moment:
Georg Wilhelm Friedrich Hegel, the famous German philosopher, gave rise to two schools —the “left” Hegelians and the “right” Hegelians. Karl Marx was the most important of the “left” Hegelians. The Nazis came from the “right” Hegelians.
I’ve never seen it put so plainly. In my own education, I was highly educated on the left branch but not the right branch. Over the last two years, coinciding with the rise of a quasi-Nazi movement in Europe and the US, right-Hegelianism has been resurgent. It should be called the other threat to liberty. In other essays, Mises goes into further detail.
In brief, Hegel’s view of history as having some acting purpose aside from individual human beings bled into an attack on the idea of economics and free markets. Hegel became the most important antiliberal until that moment of time.
Mises points out that Hegel’s following split into right and left. The right believed that history was driving toward a culminating moment in which all final authority on earth was embodied by the Prussian state and church. The left believed that the culminating moment was more universal and was characterized by the birth of a new man who would live completely differently from anyone else in history. The right Hegelians became the fascists and corporate/theocratic/ conservatives, while the left Hegelians followed socialism straight to Marx and beyond.
Using that model of understanding, you can literally reconstruct the whole of the intellectual history of politics and society from the early 19th century to the present day. It is rich and pregnant with massive implications for our own time. And, so far as I know, this is the only place he states this observation with such clarity of exposition – again, owing to the informal structure of the venue.