AP Syllabus focus:
'Philosophy shifted away from rational interpretations toward irrationality and impulse, helping spread the idea that conflict and struggle produced progress.'
In the later nineteenth century, many European thinkers challenged the Enlightenment faith in reason. They argued that instinct, will, emotion, and struggle often shaped human life more deeply than logic, calculation, or calm debate.
Why philosophy moved away from rationalism
By the late 1800s, confidence in purely rational explanations had weakened. The Enlightenment had suggested that human beings could improve society through reason, science, and orderly reform. However, many intellectuals saw modern Europe as more unstable, anxious, and conflict-ridden than that optimistic view allowed.
Several developments encouraged this shift:
the disappointment of liberal hopes after the revolutions of 1848
rapid industrialization, which seemed to create both progress and social dislocation
mass politics, which showed that crowds were often moved by passion rather than reason
growing doubt that morality, religion, and politics rested on universal rational truths
This philosophical turn is often called irrationalism.
Irrationalism: A philosophical trend that argued reason was not the sole or highest guide to human life, emphasizing instinct, will, emotion, intuition, and impulse.
Irrationalist thinkers did not always reject thinking or analysis altogether. Instead, they questioned the claim that reason could fully explain human motives, moral values, or historical change. In their view, human beings were driven by deeper forces that rational systems often ignored.
Major thinkers and their ideas
Arthur Schopenhauer as an early influence
Although he wrote earlier in the nineteenth century, Arthur Schopenhauer strongly influenced later irrationalist thought. He argued that beneath reason lay a blind, restless will that drove human existence. Human beings believed they acted rationally, but their lives were shaped by desire, striving, and dissatisfaction.
Schopenhauer challenged the optimistic belief that history naturally moved toward improvement. Instead, he presented life as struggle and suffering. Later philosophers did not always accept his pessimism, but they took seriously his claim that reason was not master of human behavior.
This painted portrait shows Arthur Schopenhauer (c. 1815), a key early influence on later “irrationalist” critiques of Enlightenment confidence in reason. Using a portrait here reinforces that Schopenhauer’s central claim—human life driven by a restless “will” beneath rational thought—emerged from a specific nineteenth-century intellectual world, not from abstract theory alone. Source
Friedrich Nietzsche and the critique of rational morality
Friedrich Nietzsche became one of the most important critics of rational and moral certainty. He attacked conventional Christianity, middle-class morality, and the belief that all people should live by the same universal standards. He argued that such values often rewarded weakness, conformity, and submission rather than strength and creativity.
Nietzsche believed that life was driven by a will to power, meaning a drive toward assertion, creativity, and self-overcoming.
This Library of Congress photograph record presents Friedrich Nietzsche as a recognizable historical actor, not just a set of arguments about morality and reason. Visually pairing Nietzsche with the “will to power” discussion helps students connect the concept to the broader late-nineteenth-century turn toward instinct, struggle, and self-overcoming in European thought. Source
For him, the healthiest individuals did not simply obey inherited rules. They created values through struggle, discipline, and courage.
This helped spread the idea that conflict was not always destructive. Nietzsche suggested that struggle could produce excellence, vitality, and cultural renewal. Comfort, safety, and excessive equality, by contrast, could produce mediocrity and stagnation.
Nietzsche was not praising war in a simple political sense. His idea of struggle often meant inner conflict, intellectual challenge, and the overcoming of weakness. Still, later readers sometimes turned his ideas in harsher and more political directions.
Henri Bergson and intuition
Henri Bergson also challenged overly rational and mechanical views of life. He argued that reality, especially life and consciousness, could not be understood fully through detached analysis alone. Instead, intuition offered a deeper way of grasping movement, creativity, and lived experience.
Bergson’s philosophy pushed against the idea that human life operated like a machine governed only by fixed laws. He emphasized spontaneity, energy, and creative development. In doing so, he reinforced the broader intellectual move away from rigid rational systems.
Georges Sorel and the value of struggle
Georges Sorel took irrationalist ideas into social and political thought. He distrusted parliamentary compromise and rational planning, believing that powerful collective myths could move people to action more effectively than logical arguments.
Sorel argued that struggle, especially class struggle, could revive energy and moral seriousness in society.
This photograph depicts Georges Sorel (dated 1928 on the hosting page), a major figure who carried anti-rationalist themes into political theory. Placing Sorel’s image alongside the discussion underscores how “myth,” mobilization, and conflict were framed as energizing forces—not merely as philosophical ideas, but as strategies for mass politics. Source
He viewed conflict as productive because it forced commitment, sacrifice, and action. This was another major step in linking progress to struggle, rather than to peaceful reform alone.
Core themes of irrationalist philosophy
The limits of reason
A central claim of these philosophers was that reason had clear limits. Human beings often acted from:
instinct
emotion
unconscious desire
intuition
ambition
collective passion
This challenged the older belief that politics and ethics could be built securely on universal reason. It also weakened confidence in the idea that history followed a calm, rational path toward improvement.
Conflict as a creative force
Another major theme was that struggle could be productive. Earlier liberal thought often emphasized compromise, gradual reform, and rational discussion. Irrationalist thinkers argued that these alone could not generate greatness or renewal.
For Nietzsche, struggle produced stronger individuals and more powerful cultures. For Sorel, social conflict could awaken commitment and collective purpose. Even when these thinkers differed sharply, they shared the belief that energy, tension, and contest could drive change.
Critique of bourgeois society
Many irrationalist philosophers criticized bourgeois society for being too comfortable, cautious, and materialistic. They believed modern life encouraged conformity, calculation, and spiritual emptiness. Their emphasis on impulse and conflict was partly a rebellion against what they saw as mediocrity in modern mass society.
Historical significance
The turn toward irrationalism mattered because it changed how Europeans understood human nature and historical development.
Its significance included:
weakening faith in the Enlightenment idea that reason alone guided progress
encouraging interest in instinct, emotion, and myth
challenging liberal confidence in debate, compromise, and universal moral rules
helping create an intellectual climate more open to conflict, activism, and intense forms of politics
These ideas did not produce one single political program. Some inspired cultural criticism, others radical politics, and others new ways of thinking about individuality. What united them was a shared rejection of the belief that reason by itself explained humanity or guaranteed progress.
FAQ
Nietzsche distrusted rigid philosophical systems, so his style was part of his message.
Short, striking statements allowed him to:
provoke readers rather than reassure them
challenge habitual ways of thinking
avoid presenting philosophy as a closed, final system
He wanted readers to wrestle with ideas, not merely absorb them passively. In that sense, his form reflected his belief that intellectual struggle could be productive.
Bergson did not mean a random guess or a vague feeling.
He used intuition to describe a direct, lived grasp of reality, especially of time, motion, and consciousness. He thought analytical reason breaks things into parts, which is useful, but may miss the fluid character of life.
This made his work appealing to people who felt that scientific or mechanical models could not fully explain human experience.
For Sorel, a myth was not just an untrue story.
It was a powerful image or narrative that could inspire people to collective action. Its value lay less in factual accuracy than in its ability to create unity, discipline, and commitment.
That is why Sorel thought myth could matter more politically than careful argument. He believed people were often mobilised by emotionally charged visions rather than by logical persuasion.
No. They shared doubts about reason’s supremacy, but they were not one political camp.
Some were cultural critics, some were moral rebels, and some moved towards revolutionary or anti-parliamentary ideas. Their common ground was philosophical rather than programmatic.
This is important because later political movements often borrowed from them selectively, sometimes in ways those thinkers themselves would not have fully accepted.
Their influence grew through:
cheap print culture
literary journals and reviews
lecture circuits
university discussion
translation across European languages
Writers, artists, and political activists often encountered these philosophers indirectly through essays, salons, and public debate rather than through formal philosophical study.
This wider circulation helped turn specialised philosophical arguments into broader cultural attitudes about instinct, conflict, heroism, and renewal.
Practice Questions
Identify one way late nineteenth-century philosophers challenged Enlightenment rationalism, and briefly explain its significance. (2 marks)
1 mark for identifying a valid challenge, such as emphasizing instinct, emotion, will, intuition, or impulse over reason.
1 mark for explaining significance, such as showing that human behavior could not be understood fully through logic alone or weakening faith in rational progress.
Explain how the ideas of Friedrich Nietzsche and Georges Sorel reflected the philosophical turn toward irrationalism. In your answer, show how each linked conflict or struggle to progress. (5 marks)
1 mark for explaining Nietzsche’s rejection of universal rational morality or his critique of conformity.
1 mark for explaining Nietzsche’s belief that struggle, self-overcoming, or the will to power could produce strength or cultural vitality.
1 mark for explaining Sorel’s distrust of rational parliamentary politics or his emphasis on myth as a force for action.
1 mark for explaining Sorel’s view that conflict, especially class struggle, could renew social energy and commitment.
1 mark for analysis connecting both thinkers to the broader shift away from reason toward impulse, action, and struggle as engines of change.
