It is still fascinating to trace back the divergent developments like american-flavoured christian sects or philosophical schools of "pragmatism", "rationalism" etc. which get super-charged by technological disruptions.
In my youth I was heavily influenced by the so-called Bildung which can be functionally thought of as a form of ersatz religion and is maybe better exemplified in the literary tradition of the Bildungsroman.
I've grappled with and wildly fantasized about all sorts of things, experimented mindlessly with all kinds of modes of thinking and consciousness amidst my coming-of-age, in hindsight without this particular frame of Bildung left by myself I would have been left utterly confused and maybe at some point acted out on it. By engaging with books like Der Zauberberg by Thomas Mann or Der Mann ohne Eigenschaften by Robert Musil, my apparent madness was calmed down and instead of breaking the dam of a forming social front of myself with the vastness of the unconsciousness, over time I was guided to develop my own way into slowly operating it appropriately without completely blowing myself up into a messiah or finding myself eternally trapped in the futility and hopelessness of existence.
Borrowing from my background, one effective vaccination which spontaneously came up in my mind against rationalists sects described here, is Schopenhauer's Die Welt als Wille und Vorstellung which can be read as a radical continuation of Kant's Critique of Pure Reason which was trying to stress test the ratio itself. [To demonstrate the breadth of Bildung in even something like the physical sciences e.g. Einstein was familiar with Kant's a priori framework of space and time, Heisenberg's autobiographical book Der Teil und das Ganze was motivated by: "I wanted to show that science is done by people, and the most wonderful ideas come from dialog".]
Schopenhauer arrives at the realization because of the groundwork done by Kant (which he heavily acknowledges): that there can't even exist a rational basis for rationality itself, that it is simply an exquisitely disguised tool in the service of the more fundamental will i.e. by its definition an irrational force.
Funny little thought experiment but what consequences does this have? Well, if you are declaring the ratio as your ultima ratio you are just fooling yourself in order to be able to rationalize anything you want. Once internalized Schopenhauer's insight gets you overwhelmed by Mitleid for every conscious being, inoculating you against the excesses of your own ratio. It instantly hit me with the same force as MDMA but several years before.