Grammar of Assent
Encyclopedia
An Essay in Aid of a Grammar of Assent (commonly abbreviated to the last three words) is John Henry Newman's seminal work. While it was completed in 1870, Newman revealed to friends that it took him 20 years to write the book.

Newman's aim was to show that the scientific standards for evidence
Evidence
Evidence in its broadest sense includes everything that is used to determine or demonstrate the truth of an assertion. Giving or procuring evidence is the process of using those things that are either presumed to be true, or were themselves proven via evidence, to demonstrate an assertion's truth...

 and assent are too narrow and inapplicable in concrete life. He argued that logic and its conclusions are not transferable to real life decision making
Decision making
Decision making can be regarded as the mental processes resulting in the selection of a course of action among several alternative scenarios. Every decision making process produces a final choice. The output can be an action or an opinion of choice.- Overview :Human performance in decision terms...

 as such. As a result, it is inappropriate to judge the validity of assent in concrete faith by conventional logical standards because paper logic is unequal to the task. "Logic is loose at both ends," he said, meaning that the process of logic initially depends on restrictive assumptions and is thus unable to fit its conclusions neatly into real world situations.

Aim and content

The Grammar was an apologia
Apologetics
Apologetics is the discipline of defending a position through the systematic use of reason. Early Christian writers Apologetics (from Greek ἀπολογία, "speaking in defense") is the discipline of defending a position (often religious) through the systematic use of reason. Early Christian writers...

 for faith
Faith
Faith is confidence or trust in a person or thing, or a belief that is not based on proof. In religion, faith is a belief in a transcendent reality, a religious teacher, a set of teachings or a Supreme Being. Generally speaking, it is offered as a means by which the truth of the proposition,...

. Newman was concerned with defending faith as a legitimate product of rational human activity--that assent is not contrary to human nature. He wrote this book against the background of British Empiricism
Empiricism
Empiricism is a theory of knowledge that asserts that knowledge comes only or primarily via sensory experience. One of several views of epistemology, the study of human knowledge, along with rationalism, idealism and historicism, empiricism emphasizes the role of experience and evidence,...

 which restricted the strength and legitimacy of assent to the evidence presented for it. John Locke
John Locke
John Locke FRS , widely known as the Father of Liberalism, was an English philosopher and physician regarded as one of the most influential of Enlightenment thinkers. Considered one of the first of the British empiricists, following the tradition of Francis Bacon, he is equally important to social...

, David Hume
David Hume
David Hume was a Scottish philosopher, historian, economist, and essayist, known especially for his philosophical empiricism and skepticism. He was one of the most important figures in the history of Western philosophy and the Scottish Enlightenment...

 and John Stuart Mill
John Stuart Mill
John Stuart Mill was a British philosopher, economist and civil servant. An influential contributor to social theory, political theory, and political economy, his conception of liberty justified the freedom of the individual in opposition to unlimited state control. He was a proponent of...

, a contemporary of Newman, were the primary Empiricists that Newman was engaged with philosophically.

The Grammar is divided into two sections that ask and answer the following questions: can I believe what I don't understand? and, can I believe what cannot be absolutely proved? The first part of the Grammar is entitled "Assent and Apprehension", which deals with believing what you don't understand. The second part is entitled "Assent and Inference" and it addresses the issue of believing what cannot be absolutely proven.

Both parts deal with assent or belief
Belief
Belief is the psychological state in which an individual holds a proposition or premise to be true.-Belief, knowledge and epistemology:The terms belief and knowledge are used differently in philosophy....

. The first part discussed the relationship between assent and apprehension—what level of intelligent appropriation of a teaching is necessary to believe in that teaching. This section ultimately turns on a distinction between apprehension and understanding. Newman's view was that one can believe as long as one apprehends, even if one does not understand. For example, one may not understand the doctrine of the Trinity
Trinity
The Christian doctrine of the Trinity defines God as three divine persons : the Father, the Son , and the Holy Spirit. The three persons are distinct yet coexist in unity, and are co-equal, co-eternal and consubstantial . Put another way, the three persons of the Trinity are of one being...

, i.e., resolve the individual propositions of the doctrine into one clear whole conception, yet legitimately believe it because apprehension is possible without understanding.

Apprehension, according to Newman, is simply an "intelligent acceptance of the idea or of the fact which a proposition enunciates." So while the regular unlearned Christian
Christian
A Christian is a person who adheres to Christianity, an Abrahamic, monotheistic religion based on the life and teachings of Jesus of Nazareth as recorded in the Canonical gospels and the letters of the New Testament...

, or anyone for that matter, may not be able to conceive that God
God
God is the English name given to a singular being in theistic and deistic religions who is either the sole deity in monotheism, or a single deity in polytheism....

 is one and three, the words of the propositions that define the doctrine
Doctrine
Doctrine is a codification of beliefs or a body of teachings or instructions, taught principles or positions, as the body of teachings in a branch of knowledge or belief system...

 are clear and intellectually accessible and assent may legitimately follow.

The second part further clarified assent by comparing it with inference
Inference
Inference is the act or process of deriving logical conclusions from premises known or assumed to be true. The conclusion drawn is also called an idiomatic. The laws of valid inference are studied in the field of logic.Human inference Inference is the act or process of deriving logical conclusions...

. The key difference between assent and inference is that assent is unconditional and inference is conditional, i.e., dependent on other propositions or ideas and unable to stand by itself.

For Newman, inference described a proposition that is intrinsically dependent on other propositions. For instance, the statement, "Therefore, the car is red," is clearly dependent on antecedent propositions for its meaning and those propositions would need to be disclosed before one could meaningfully assent. This is an inferential statement as opposed to "The car in front of the house is red," which is an assertion that can be assented to because it can stand on its own.

There are three types of inferences: formal, informal and natural. Formal inference is logic
Logic
In philosophy, Logic is the formal systematic study of the principles of valid inference and correct reasoning. Logic is used in most intellectual activities, but is studied primarily in the disciplines of philosophy, mathematics, semantics, and computer science...

 in the deductive sense. For Newman, logic
Logic
In philosophy, Logic is the formal systematic study of the principles of valid inference and correct reasoning. Logic is used in most intellectual activities, but is studied primarily in the disciplines of philosophy, mathematics, semantics, and computer science...

 is indeed extremely useful especially in science and in society. However, its real-world applicability is very limited in that its usefulness is circumscribed by its initial assumption
Assumption
In logic an assumption is a proposition that is taken for granted, as if it were true based upon presupposition without preponderance of the facts...

s. For Newman, to make logic work, human thought has to be trimmed to very specific and narrow meanings such that logical statements then lose real world applicability.

Informal inference is akin to calculus
Calculus
Calculus is a branch of mathematics focused on limits, functions, derivatives, integrals, and infinite series. This subject constitutes a major part of modern mathematics education. It has two major branches, differential calculus and integral calculus, which are related by the fundamental theorem...

. In informal inference one reaches a conclusion by considering the accumulation of converging antecedent probabilities. Natural inference is when the individual, in a simple and whole process, grasps the antecedent conditions and conclusions instantaneously. For instance, if one sees smoke, one may instantly infer the presence of fire. Natural inference, in Newman's view, is related to experience or innate ability.

The second part of the Grammar is where Newman introduces the concept of the Illative Sense. The Illative sense is for Newman, the intellectual counterpart of Aristotle
Aristotle
Aristotle was a Greek philosopher and polymath, a student of Plato and teacher of Alexander the Great. His writings cover many subjects, including physics, metaphysics, poetry, theater, music, logic, rhetoric, linguistics, politics, government, ethics, biology, and zoology...

's Phronesis
Phronesis
Phronēsis is an Ancient Greek word for wisdom or intelligence which is a common topic of discussion in philosophy. In Aristotelian Ethics, for example in the Nicomachean Ethics it is distinguished from other words for wisdom as the virtue of practical thought, and is usually translated "practical...

. It is the faculty of the human mind that closes the logic-gap in concrete situations and thus allowing for assent. Logic/formal inference utilizes dependable processes that lead to a certain and firm conclusion in the fields in which it is applied. However, Newman maintained that in concrete life formal incontrovertible proof in favor of a decision is not possible—the best one can achieve is converging probabilities in favor of a conclusion. For Newman it is impossible to attain the concrete existential equivalent of logical certainty. Thus, to close that gap between converging probabilities and full assent, one needs the aid of the Illative Sense in order to attain certitude in specific situations.

Newman recognised that there are dangers associated with using the Illative Sense. In using it one may become vulnerable to superstition and eccentricity. But superstition is held in check, Newman suggests, by the moral element in the act of faith, that is, holiness, obedience, and the sense of duty will safeguard faith from becoming mere superstition.

Chapter breakdown

Part I: Assent and Apprehension
  1. Modes of holding and apprehending Propositions
  2. Assent considered as Apprehensive
  3. The Apprehension of Propositions
  4. Notional and Real Assent
  5. Apprehension and Assent in the matter of Religion


Part II: Assent and Inference
  1. Assent Considered as Unconditional
  2. Certitude
  3. Inference
  4. The Illative Sense
  5. Inference and Assent in the matter of Religion

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