Moritz Schlick

Moritz Schlick was a highly influential German philosopher and physicist. He is best known as the founder of logical positivism. He also established the Vienna Circle, a famous group of thinkers. Schlick lived from April 14, 1882, until June 22, 1936. His work helped shape how people understand the relationship between science and language. He sought to find exact knowledge through rigorous logical analysis.

Schlick's intellectual journey began with a deep interest in both science and thought. He was born in Berlin to a wealthy Prussian family. His father was Ernst Albert Schlick and his mother was Agnes Arndt. Schlick studied physics at several universities, including Heidelberg and Lausanne. He eventually studied in Berlin under the famous physicist Max Planck. Schlick chose physics because he believed mathematical physics provided exact knowledge. He completed his PhD in 1904 with a thesis on light reflection.

As his career progressed, Schlick moved into the field of philosophy. In 1908, he published a book titled Lebensweisheit about eudaemonism. This is the theory that happiness comes from personal fulfillment. Later, he wrote about the nature of truth and modern logic. Schlick also focused on the philosophy of science and epistemology. Epistemology is the study of how we acquire knowledge. He even wrote about Albert Einstein's theory of relativity. Einstein praised Schlick's work for its remarkable clarity.

In 1922, Schlick took a major position at the University of Vienna. He held the chair of Naturphilosophie, a position once held by Ludwig Boltzmann. There, he organized a regular meeting for scientists and philosophers. These meetings happened on Thursday evenings in a chemistry building. The group was initially called the Ernst Mach Association. It eventually became known globally as the Vienna Circle. Members included Hans Hahn, Rudolf Carnap, and Kurt Gödel.

The Vienna Circle studied the foundations of mathematics and language. They were deeply influenced by the work of Ludwig Wittgenstein. Wittgenstein wrote a famous book called Tractatus Logico-Philosophicus. This book proposed a logical theory of symbolism and language. Schlick and his colleagues spent much time studying these complex ideas. Schlick even encouraged Wittgenstein to return to the field of philosophy. The group's shared views helped define the movement of logical positivism.

Schlick's most significant contribution was his General Theory of Knowledge. This work, developed between 1918 and 1925, critiqued synthetic a priori knowledge. He argued that only truths of definition are self-evident. These include the rules of formal logic and mathematics. For all other statements, Schlick insisted on using empirical evidence. Empirical evidence is information gathered through our senses and observations. He believed that statements without such evidence were "metaphysical." To the Vienna Circle, metaphysics was considered meaningless or nonsense.

Schlick also addressed the complex problem of free will. Many thinkers believed science and free will could not coexist. Schlick argued this was a "pseudo-problem" caused by a misunderstanding. He noted that the word "law" has two different meanings. In legal systems, a law is a rule for behavior. In science, a natural law is simply a description of behavior. Because scientific laws describe what happens, they do not cause compulsion. This distinction helped clarify the relationship between science and human freedom.

Schlick's life ended tragically in 1936. While he was walking up the university steps, he was shot. The attacker was a former student named Johann Nelböck. Nelböck claimed that Schlick's philosophy had affected his moral restraint. He also expressed personal grievances during his trial. This violent event became a major topic in the city. It was often used by political groups to spread nationalist sentiments. Despite this sad end, Schlick's legacy as a founder of logical positivism remains vital in modern philosophy.