This is an excellent history of Western thought in the mid-to-late 19th century.
The title, “The Crisis of Reason,” is somewhat confusing. The crisis part was the break from Christian authoritarianism (God’s word) that had dominated Western thought for centuries to modes of thinking that were distinctly not that at all. Mainly, the replacement thought paradigm was scientific, which is to say materialistic-based, and not religious or metaphysical at all. This in turn prompted questions and concerns about the human place in the cosmos - meaning, and the grounds for moral behavior. Taken to its extreme, without God, there was no purpose, with the possible exception of humanitarianism, but that was threatened by the social Darwinians and the argument that only the fittest survive. Thus, the reference to reason, might have been this transition between the Platonic-Christian notion of universal and eternal reason, as embodied by the Good and God, and the non-transcendent notion of reason that employed rational end-means coordination for humanitarian benefit.
I was struck by the presence of so many not currently well-known thinkers who led the move toward a this-worldly-based belief system. These included Jacob Moleschott (1827-1893) who saw energy as a quality of matter, and who viewed life as matter in motion. Ludwig Buchner (1824-1899) cast religion aside completely in favor of materialist science (interestingly, he apparently tied Pythagorist and Plato to Brahmic thought), expressing confidence that science alone could watch out and care for humankind as “scientific humanitarianism.” He took Moleschott’s “No matter without force and no force without matter” and said that force - the source of all movement - was within matter, not above, located in some non-material realm. John Tyndall (1826-1893), a successor to Faraday, linked matter and activity, and said that matter creates life and that life was about the conservation of energy.
David Friedrich Strauss (1808-1874) focused on the non-divine, historical Jesus. In taking that Christian icon down a notch, he replaced the gospel of Jesus with the gospel of science, especially Darwinism, and reputedly turning this into a sort of a nature worship. The human task was to “ennoble nature” and invest it with attributes of divinity. Ernst Haeckel (1834-1915) wrote similarly with his monism where evolution was the manifestation of the cosmos’s creative force and the evolution of the world soul, and nature contemplation was the contemplation of the All. Matter for him was alive with its attributes, and governed by desire/dislike, lust/antipathy, attraction and repulsion.
Hippolyte Taine (1828-1893) said that the “universal empire of causality” forbade “the erection of any crucial barrier between the human and physical sciences.” The self’s task was to know universal laws and to submit to them. Taine also argued for a science of culture in which people are seen as products of their past - he was Lamarckian not Darwinian, though Darwin walked a fuzzy line here - and, thus, character was modifiable and those modifications were inheritable. That view was taken to an extreme by Taine’s follower, Gustave LeBon (1841-1931), whose, The Crowd dismissed the sheer irrationality of mass behavior, likening it to a massive electro-magnetic field.
Ernst Mach (1838-1916), known for his work in physics, saw human behavior strictly in environmental determinism terms. Humans were formed from the outside. There is, thus, no self. There is only perpetual adaptation to what the environment dictated. Knowledge for humans was pretty much left to adaptive utility. Hans Vaihinger (1852-1913) echoed Mach by saying that mind’s role was in service of adaptive success, but he took a step further in this line of thought by arguing that knowledge had a non-utilitarian function by making humans feel better. God, immortality and free will are the big three in these “useful fictions.”
Parallelling Schopenhauer, Eduard Von Hartmann (1842-1906) talked about “the unconscious Will,” but unlike Schopenhauer, he saw it as teleological - the emergence of the conscious from the unconscious, with the former eventually overcoming the Will’s relentless striving. The only relief for Hartmann was the suspension of desire via the emancipation of the intellect (consciousness) from the Will, and the merger, via selflessness, into the great cosmic web. Whereas the unconscious was both Will and Reason, for Hartmann, consciousness was Reason’s (the Idea) precedence over the Will, and a return to the original state of non-willing, nothingness and a state of quiescence (Nirvana).
The book covers other facets of European thought, but these thinkers that occupy a key transition between philosophical religion and science-based philosophical modes of thinking interested me most.