Common sense
Common sense is "knowledge, judgement, and taste which is more or less universal and which is held more or less without reflection or argument". As such, it is often considered to represent the basic level of sound practical judgement or knowledge of basic facts that any adult human being ought to possess. It is "common" in the sense of being shared by nearly all people. Relevant terms from other languages used in such discussions include the aforementioned Latin, itself translating Ancient Greek κοινὴ αἴσθησις, and French bon sens. However, these are not straightforward translations in all contexts, and in English different shades of meaning have developed. In philosophical and scientific contexts, since the Age of Enlightenment the term "common sense" has been used for rhetorical effect both approvingly and disapprovingly. On the one hand it has been a standard for good taste, good sense, and source of scientific and logical axioms. On the other hand it has been equated to conventional wisdom, vulgar prejudice, and superstition.
"Common sense" has at least two older and more specialized meanings which have influenced the modern meanings, and are still important in philosophy. The original historical meaning is the capability of the animal soul, proposed by Aristotle to explain how the different senses join and enable discrimination of particular objects by people and other animals. This common sense is distinct from the several sensory perceptions and from human rational thought, but it cooperates with both. The second philosophical use of the term is Roman-influenced, and is used for the natural human sensitivity for other humans and the community. Just like the everyday meaning, both of the philosophical meanings refer to a type of basic awareness and ability to judge that most people are expected to share naturally, even if they cannot explain why. All these meanings of "common sense", including the everyday ones, are interconnected in a complex history and have evolved during important political and philosophical debates in modern Western civilisation, notably concerning science, politics and economics. The interplay between the meanings has come to be particularly notable in English, as opposed to other western European languages, and the English term has in turn become international.
It was at the beginning of the 18th century that this old philosophical term first acquired its modern English meaning: "Those plain, self-evident truths or conventional wisdom that one needed no sophistication to grasp and no proof to accept precisely because they accorded so well with the basic intellectual capacities and experiences of the whole social body." This began with Descartes's criticism of it, and what came to be known as the dispute between "rationalism" and "empiricism". In the opening line of one of his most famous books, Discourse on Method, Descartes established the most common modern meaning, and its controversies, when he stated that everyone has a similar and sufficient amount of common sense, but it is rarely used well. Therefore, a skeptical logical method described by Descartes needs to be followed and common sense should not be overly relied upon. In the ensuing 18th century Enlightenment era, common sense came to be seen more positively as the basis for empiricist modern thinking. It was contrasted to metaphysics, which was, like Cartesianism, associated with the Ancien Régime. Thomas Paine's polemical pamphlet Common Sense has been described as the most influential political pamphlet of the 18th century, affecting both the American and French revolutions. Today, the concept of common sense, and how it should best be used, remains linked to many of the most perennial topics in epistemology and ethics, with special focus often directed at the philosophy of the modern social sciences.
Aristotelian
Roman
"Sensus communis" is the Latin translation of the Greek, which came to be recovered by medieval scholastics when discussing Aristotelian theories of perception. In the earlier Latin of the Roman Empire, the term had taken a distinct ethical detour, developing new shades of meaning. These especially Roman meanings were apparently influenced by several Stoic Greek terms with the word ; not only, but also such terms as , , and, all of which involve —something, at least in Aristotle, that would not be present in "lower" animals.- is a term from Stoic philosophy, a Greek philosophy, influenced by Aristotle, and influential in Rome. This refers to shared notions, or common conceptions, that are either in-born or imprinted by the senses on to the soul. Unfortunately few true Stoic texts survive, and our understanding of their technical terminology is limited.
- is a term found in Epictetus, a Stoic philosopher. C.S. believed this to be close to a modern English meaning of "common sense", "the elementary mental outfit of the normal man", something like intelligence. He noted that sensus could be a translation of,, but he only found one clear case of a Latin text showing this apparent meaning, a text by Phaedrus the fable writer.
- is found only in the work of the emperor Marcus Aurelius, also known as a Stoic. He uses the word on its own in a list of things he learned from his adopted father. Anthony Ashley Cooper, 3rd Earl of Shaftesbury felt it represented the Stoic Greek original, which gave the special Roman meaning of sensus communis, especially when used to refer to someone's public spirit. He explained the change of meaning as being due to the specific way that Stoics understood perception and intellect, saying that one should "consider withal how small the distinction was in that Philosophy, between the wikt:ὑπόληψις , and the vulgar wikt:αἴσθησις ; how generally Passion was by those Philosophers brought under the Head of Opinion".
In his Rhetoric for example Aristotle mentions "" or "common beliefs", saying that "our proofs and arguments must rest on generally accepted principles, when speaking of converse with the multitude". In a similar passage in his own work on rhetoric, De Oratore, Cicero wrote that "in oratory the very cardinal sin is to depart from the language of everyday life and the usage approved by the sense of the community." The sense of the community is in this case one translation of "communis sensus" in the Latin of Cicero.
Whether the Latin writers such as Cicero deliberately used this Aristotelian term in a new more peculiarly Roman way, probably also influenced by Greek Stoicism, therefore remains a subject of discussion. has proposed for example that the Roman Republic maintained a very "oral" culture whereas in Aristotle's time rhetoric had come under heavy criticism from philosophers such as Socrates. argues, in agreement with Shaftesbury, that the concept developed from the Stoic concept of ethical virtue, influenced by Aristotle, but emphasizing the role of both the individual perception, and shared communal understanding. A complex of ideas attached itself to the term, to be almost forgotten in the Middle Ages, and eventually returning into ethical discussion in 18th-century Europe, after Descartes.
As with other meanings of common sense, for the Romans of the classical era "it designates a sensibility shared by all, from which one may deduce a number of fundamental judgments, that need not, or cannot, be questioned by rational reflection". But even though Cicero did at least once use the term in a manuscript on Plato's Timaeus, he and other Roman authors did not normally use it as a technical term limited to discussion about sense perception, as Aristotle apparently had in De Anima, and as the Scholastics later would in the Middle Ages. Instead of referring to all animal judgment, it was used to describe pre-rational, widely shared human beliefs, and therefore it was a near equivalent to the concept of humanitas. This was a term that could be used by Romans to imply not only human nature, but also humane conduct, good breeding, refined manners, and so on. Apart from Cicero, Quintilian, Lucretius, Seneca, Horace and some of the most influential Roman authors influenced by Aristotle's rhetoric and philosophy used the Latin term "sensus communis" in a range of such ways. As C. S. Lewis wrote:
Compared to Aristotle and his strictest medieval followers, these Roman authors were not so strict about the boundary between animal-like common sense and specially human reasoning. As discussed above, Aristotle had attempted to make a clear distinction between, on the one hand, imagination and the sense perception which both use the sensible, and which animals also have; and, on the other hand, and reason, which perceives another type of, the intelligible forms, which only humans have. In other words, these Romans allowed that people could have animal-like shared understandings of reality, not just in terms of memories of sense perceptions, but in terms of the way they would tend to explain things, and in the language they use.
Cartesian
One of the last notable philosophers to accept something like the Aristotelian "common sense" was Descartes in the 17th century, but he also undermined it. He described this inner faculty when writing in Latin in his Meditations on first philosophy. The common sense is the link between the body and its senses, and the true human mind, which according to Descartes must be purely immaterial. Unlike Aristotle, who had placed it in the heart, by the time of Descartes this faculty was thought to be in the brain, and he located it in the pineal gland. Descartes' judgement of this common sense was that it was enough to persuade the human consciousness of the existence of physical things, but often in a very indistinct way. To get a more distinct understanding of things, it is more important to be methodical and mathematical. This line of thought was taken further, if not by Descartes himself then by those he influenced, until the concept of a faculty or organ of common sense was itself rejected.Contemporaries such as Gassendi and Hobbes went beyond Descartes in some ways in their rejection of Aristotelianism, rejecting explanations involving anything other than matter and motion, including the distinction between the animal-like judgement of sense perception, a special separate common sense, and the human mind or, which Descartes had retained from Aristotelianism. In contrast to Descartes who "found it unacceptable to assume that sensory representations may enter the mental realm from without"...
But Descartes used two different terms in his work, not only the Latin term "sensus communis", but also the French term bon sens, with which he opens his Discourse on Method. And this second concept survived better. This work was written in French, and does not directly discuss the Aristotelian technical theory of perception. Bon sens is the equivalent of modern English "common sense" or "good sense". As the Aristotelian meaning of the Latin term began to be forgotten after Descartes, his discussion of bon sens gave a new way of defining sensus communis in various European languages.
writes that "Descartes is the source of the most common meaning of common sense today: practical judgment". Gilson noted that Descartes actually gave bon sens two related meanings, first the basic and widely shared ability to judge true and false, which he also calls raison ; and second, wisdom, the perfected version of the first. The Latin term Descartes uses, bona mens, derives from the Stoic author Seneca who only used it in the second sense. Descartes was being original.
The idea that now became influential, developed in both the Latin and French works of Descartes, though coming from different directions, is that common good sense is not reliable enough for the new Cartesian method of skeptical reasoning. The Cartesian project to replace common good sense with clearly defined mathematical reasoning was aimed at certainty, and not mere probability. It was promoted further by people such as Hobbes, Spinoza, and others and continues to have important impacts on everyday life. In France, the Netherlands, Belgium, Spain and Italy, it was in its initial florescence associated with the administration of Catholic empires of the competing Bourbon, and Habsburg dynasties, both seeking to centralize their power in a modern way, responding to Machiavellianism and Protestantism as part of the Counter-Reformation.
So after Descartes, critical attention turned from Aristotle and his theory of perception, and more towards Descartes' own treatment of common good sense, concerning which several 18th-century authors found help in Roman literature.