Presocratic Philosophy: Origins of Reason and the Arche

The Presocratics: Origins of Western Philosophy

It is generally recognized that the history of philosophy has its origins in Greece during the Archaic Period (seventh to sixth century BC). During this era, the development of alphabetic writing and the rise of the polis—independent city-states that served as centers of political power, trade, and cultural life—transformed society. As the Greek region was mountainous and resource-poor, residents of small cities frequently engaged in maritime trade and colonization to ensure subsistence. Through this expansion across the Mediterranean, they established thriving cities in the eastern Iberian Peninsula, Sicily, and the southern Italian mainland.

The Birth of Greek Philosophy

Greek philosophy was born in Miletus, one of the largest coastal cities of Asia Minor. Its founder was Thales of Miletus. These thinkers were the first to consider reason as the appropriate means of understanding reality, marking the transition from mythos to logos: philosophers began to rely on experience and reason to explain the origin of things and natural phenomena rather than mythical accounts of the gods.

The Concept of the Arche

The Presocratics sought to discover the permanent and immutable essence of reality (the being) in contrast to its many appearances and changes. They attempted to find a stable element within the physical world—a common root to all substances. This principle was called the arche, a term meaning beginning or commencement, which could be discovered through reason.

Monistic and Pluralistic Schools

The Presocratics are divided into monists and pluralists, depending on whether they believed the arche consisted of one or multiple elements.

Monists

• Thales of Miletus (624–546 BC): A renowned mathematician and astronomer who argued that the arche is water.
• Heraclitus (530–460 BC): Stated that nature is governed by a single principle, symbolized by fire.

Pluralists

• Empedocles (490–423 BC): Asserted that all beings are constituted by four roots: water, air, fire, and earth. These principles are simple, indivisible, eternal, and life-generating.
• Anaxagoras (495–428 BC): Proposed that there are infinite invisible material particles, called "seeds," from which all beings are formed. These seeds are eternal and immutable; they neither arise nor perish but blend and separate. He claimed that these seeds move and combine due to an ordering intelligence (nous).
• Democritus (460–370 BC): Argued that all things are formed by agglomerates of atoms—indivisible particles moving in a vacuum and combining at random.