A critical history of Greek philosophy

by W. T. Stace

Zeno of Cyprus, the founder of the Stoic School, a Greek of Phoenician descent, was born about 342 B.C., and died in 270. He is said to have followed philosophy; because he lost all his property in a ship-wreck--a motive characteristic of the age. He came to Athens, and learned philosophy under Crates the Cynic, Stilpo the Megaric, and Polemo the Academic. About 300 B.C. he founded his school at the Stoa Poecile (many-coloured portico) whence the name Stoic. He died by his own hand. He was followed by Cleanthes, and then by Chrysippus, as leaders of the school. Chrysippus was a man of immense productivity and laborious scholarship. He composed over seven hundred books, but all are lost. Though not the founder, he was the chief pillar of Stoicism. The school attracted many adherents, and flourished for many centuries, not only in Greece, but later in Rome, where the most thoughtful writers, such as Marcus Aurelius, Seneca, and Epictetus, counted themselves among its followers.

We know little for certain as to what share particular Stoics, Zeno, Cleanthes, or Chrysippus, had in the formation of the doctrines of the school. But after Chrysippus the main lines of the doctrine were complete. [{345}] We shall deal, therefore, with Stoicism as a whole, and not with the special teaching of particular Stoics. The system is divided into three parts, Logic, Physics, and Ethics, of which the first two are entirely subservient to the last. Stoicism is essentially a system of ethics which, however, is guided by a logic as theory of method, and rests upon physics as foundation.

Logic.

We may pass over the formal logic of the Stoics, which is, in all essentials, the logic of Aristotle. To this, however, they added a theory, peculiar to themselves, of the origin of knowledge and the criterion of truth. All knowledge, they said, enters the mind through the senses. The mind is a tabula rasa, upon which sense-impressions are inscribed. It may have a certain activity of its own, but this activity is confined exclusively to materials supplied by the physical organs of sense. This theory stands, of course, in sheer opposition to the idealism of Plato, for whom the mind alone was the source of knowledge, the senses being the sources of all illusion and error. The Stoics denied the metaphysical reality of concepts. Concepts are merely ideas in the mind, abstracted from particulars, and have no reality outside consciousness.

Since all knowledge is a knowledge of sense-objects, truth is simply the correspondence of our impressions to things. How are we to know whether our ideas are correct copies of things? How distinguish between reality and imagination, dreams, or illusions? What is the criterion of truth? It cannot lie in concepts, since these are of our own making. Nothing is true save [{346}] sense-impressions, and therefore the criterion of truth must lie in sensation itself. It cannot be in thought, but must be in feeling. Real objects, said the Stoics, produce in us an intense feeling, or conviction, of their reality. The strength and vividness of the image distinguish these real perceptions from a dream or fancy. Hence the sole criterion of truth is this striking conviction, whereby the real forces itself upon our consciousness, and will not be denied. The relapse into complete subjectivity will here be noted. There is no universally grounded criterion of truth. It is based, not on reason, but on feeling. All depends on the subjective convictions of the individual.

Physics.

The fundamental proposition of the Stoic physics is that "nothing incorporeal exists." This materialism coheres with the sensationalism of their doctrine of knowledge. Plato placed knowledge in thought, and reality, therefore, in the Idea. The Stoics, however, place knowledge in physical sensation, and reality, therefore, in what is known by the senses, matter. All things, they said, even the soul, even God himself, are material and nothing more than material. This belief they based upon two main considerations. Firstly, the unity of the world demands it. The world is one, and must issue from one principle. We must have a monism. The idealism of Plato and Aristotle had resolved itself into a futile struggle against the dualism of matter and thought. Since the gulf cannot be bridged from the side of the Idea, we must take our stand on matter, and reduce mind to it. Secondly, body and soul, God and [{347}] the world, are pairs which act and react upon one another. The body, for example, produces thoughts (sense-impressions) in the soul, the soul produces movements in the body. This would be impossible if both were not of the same substance. The corporeal cannot act on the incorporeal, nor the incorporeal on the corporeal. There is no point of contact. Hence all must be equally corporeal.

All things being material, what is the original kind of matter, or stuff, out of which the world is made? The Stoics turned to Heracleitus for an answer. Fire is the primordial kind of being, and all things are composed of fire. With this materialism the Stoics combined pantheism. The primal fire is God. God is related to the world exactly as the soul to the body. The human soul is likewise fire, and comes from the divine fire. It permeates and penetrates the entire body, and, in order that its interpenetration might be regarded as complete, the Stoics denied the impenetrability of matter. Just as the soul-fire permeates the whole body, so God, the primal fire, pervades the entire world. He is the soul of the world. The world is His body.

But in spite of this materialism, the Stoics averred that God is absolute reason. This is not a return to idealism. It does not imply the incorporeality of God. For reason, like all else, is material. It means simply that the divine fire is a rational element. Since God is reason, it follows that the world is governed by reason, and this means two things. It means, firstly, that there is purpose in the world, and therefore, order, harmony, beauty, and design. Secondly, since reason is law as opposed to the lawless, it means that the universe is [{348}] subject to the absolute sway of law, is governed by the rigorous necessity of cause and effect.

Hence the individual is not free. There can be no true freedom of the will in a world governed by necessity. We may, without harm, say that we choose to do this or that, that our acts are voluntary. But such phrases merely mean that we assent to what we do. What we do is none the less governed by causes, and therefore by necessity.