The radical movement that tried to delete metaphysics from human language
In the 1920s, a group of thinkers known as the Vienna Circle attempted a daring philosophical overhaul. Their goal was to strip language of everything that could not be empirically verified, effectively labeling theology, ethics, and aesthetics as cognitively meaningless.
Emerging in the late 1920s, logical positivism sought to establish a scientific philosophy as authoritative as empirical science. Led by Moritz Schlick, the movement was anchored by the 'verifiability principle.' This criterion asserted that a statement is only meaningful if it is a tautology or can be verified through sensory observation. Consequently, the movement dismissed metaphysics and theology as 'pseudostatements'—assertions that lack factual content or truth value.
The movement was not a monolith. While Schlick held a more conservative view, a 'radical left wing' including Otto Neurath and Rudolf Carnap sought to liberalize empiricism. They grappled with the fact that universal scientific laws are, by definition, impossible to fully verify. Carnap eventually proposed 'confirmation' as a substitute for verification, using mathematical tools to assign degrees of probability to hypotheses, though a complete model remained elusive.
The movement's decline was precipitated by internal contradictions and external critiques. Philosophers like Karl Popper and W.V.O. Quine identified intractable problems within its central tenets. Furthermore, mathematical breakthroughs by Kurt Gödel and Alfred Tarski undermined the hope of reducing all mathematics to logic. By the 1960s, the movement had largely been abandoned, with philosopher John Passmore famously declaring it 'dead' in 1967.
Despite its decline, the movement's legacy persists. As members fled the rise of the Nazi Party in the 1930s, they carried these ideas to the English-speaking world. This migration transformed logical positivism into a foundation for modern analytic philosophy and the philosophy of science, influencing how we structure scientific language and the distinction between factual and evaluative claims.
Source: Logical positivism
