They did not all know each other, and they certainly did not all agree on many topics. They are divided into a number of different subgroups.
Yet they are all categorized together, and for good reasons. Yes, it’s true that they all — or most of them — did their work prior to the famous career of Socrates. But there is a better reason for lumping them all together. It’s the way they thought — the way they reasoned. Even when they came to different conclusions, they were using similar methods.
Donald Palmer explains that “the thinkers who were active in Greece between” 600 B.C. and 350 B.C. “are known today as the pre-Socratic philosophers, even though the last group so designated were actually contemporaries of Socrates.” Those dates are, of course, approximate, because these kinds of trends fade into, and out of, existence in a gradual way.
While the beginning and ending of a construct like the Presocratic era is fuzzy, the life of Socrates had definite beginning and ending points. Socrates was born in 469 B.C. and died in 399 B.C.
Donald Palmer explains some common threads among the diverse group: “What all the pre-Socratic philosophers have in common is their attempt to create general theories of the cosmos (kosmos is the Greek term for “world”) not simply by repeating the tales of” what happened, but rather explaining why and how it happened.
The Presocratics thought that myths — even when they are true — are not sufficient explanations. A myth is an explanation by means of narrative. A myth can be true or false. In slang and casual speech, ‘myth’ is sometimes used to refer to a falsehood, but that is not its meaning in philosophical discourse. The Presocratics pointed out that, if a conceptual explanation was given in addition to a myth, then the net amount of knowledge and understanding would be greater.
For example: a person might ask about how the first men arrived on the moon and walked around on it. A mythological answer would talk about Wernher von Braun and Neil Armstrong and the Apollo spacecraft, etc.. That myth would be true as far as it went, but it lacks some information.
A conceptual answer would talk about the forces of gravity, how much acceleration a spacecraft needs to reach a certain speed, what the escape velocity is for earth orbit, etc.
The Presocratics wanted to explain physical phenomena, not by giving a narrative, “but by using observation and reason to construct general theories that would explain to the” rational “and curious mind the secrets behind the appearances in the world.” A conceptual answer articulates principles which can be applied beyond the case in question. A mythological answer, even when it’s true, is usually limited to a concrete and specific instance.
Another commonality was that all the pre-Socratic philosophers stemmed from the outlying borders of the Greek world: islands in the Ionian Sea or Greek colonies in Italy or along the coast of Persia (in today’s Turkey).
Some scholars speculate that social life on the edges of the Greek Empire was more interesting than life back home on the Greek mainland, and that this circumstance occasioned the birth of philosophy. This is an interesting hypothesis, with plausible arguments both for and against it.
In any case, “knowledge of these thinkers is tremendously important not only for understanding the Greek world of their time, but” for gaining insights into modern physics, modern mathematics, and modern philosophy. Of course, one must also define when the modern era begins.
One of the reasons that the study of the Presocratics is good “for grasping the origins of” most subsequent “philosophy and science” is that they developed a concept of matter. One might look at different objects: a tree, an iceberg, a distant planet.
Those objects seem dissimilar to one another, but the Presocratics saw that they were all physical objects, and that there is some underlying commonality shared by all physical objects. They are all composed of matter. This is an abstraction. Abstraction is important in philosophy, in physics, and in all rational thought.
The Latin words from which the word ‘abstract’ arises mean to “pull away” or to “take off.” In abstraction, the thinker “pulls away” a concept or a principle from the specific instance in which she or he finds it. Having separated the concept from the context, she or he can then apply that concept elsewhere — or everywhere.
The Presocratics developed a way of understanding the universe which was systematic and unified. Their understanding revealed an underlying structure to reality which made modern physics possible. This understanding included that reality is intelligible, i.e., that it can be understood; that some laws of nature are universal, i.e., they apply everywhere and everywhen; and that certain elements of logic and mathematics are the foundations of the universe.
