Reasons and Persons
Encyclopedia
Reasons and Persons is a philosophical
work by Derek Parfit
, first published in 1984. It focuses on ethics
, rationality
and personal identity.
It is divided into four parts, dedicated to self-defeating theories, rationality and time, personal identity and responsibility toward future generations.
, which Parfit claims fails due to the Prisoner's dilemma
.
Ultimately, Parfit rejects "common sense morality" on similar grounds. Parfit himself does not explicitly endorse a particular view; rather, he shows what the problems of different theories are. His only positive endorsement is of "impersonal ethics" — impersonality being the common denominator of the different parts of the book.
and time
, dealing with questions such as: should we take into account our past desires?, should I do something I will regret later, even if it seems a good idea now?, and so on.
One of Parfit's arguments is as follows: self-interest theorists consider the differences between different persons at the same time as significant in terms of rationality, but do not consider the difference between the same person at the different times to be as significant. But if, as Parfit argues, a reductionist theory of personal identity holds, then the difference between different persons at the same time is more like the difference between the same persons at different times. So, if non-reductionism is true, self-interest
theorists are inconsistent in viewing spatial relations as significant but temporal relations insignificant. Thus, the foundations of the self-interest theory are undermined by non-reductionism, which lends support to the present-aim theory of rationality, the critical version of which Parfit favours.
At time 1, there is a person. At a later time 2, there is a person. These people seem to be the same person. Indeed, these people share memories and personality traits. But there are no further facts in the world that make them the same person.
Parfit continues this logic to establish a new context for morality and social control. He cites that it is morally wrong for one person to harm or interfere with another person and it is incumbent on society to protect individuals from such transgressions. That accepted, it is a short extrapolation to conclude that it is also incumbent on society to protect an individual's "Future Self" from such transgressions; tobacco use could be classified as an abuse of a Future Self's right to a healthy existence. Parfit resolves the logic to reach this conclusion, which appears to justify incursion into personal freedoms, but he does not explicitly endorse such invasive control.
Parfit's argument for this position relies on our intuitions regarding thought experiment
s such as teleportation
, the fission and fusion of persons, gradual replacement of the matter in one's brain, gradual alteration of one's psychology, and so on.
Parfit's conclusion is similar to David Hume
's view, and also to the view of the self in Buddhism
, though it does not restrict itself to a mere reformulation of them. For besides being reductive, Parfit's view is also deflationary: in the end, "what matters" is not personal identity, but rather mental continuity and connectedness.
One question Parfit raises is this: given that the course of history drastically affects what people are actually born (since it affects which potential parents actually meet and have children; and also, a difference in the time of conception will alter the genetic makeup of the child), do future persons have a right to complain about our actions, since they likely wouldn't exist if things had been different?
Another problem Parfit looks at is the mere addition paradox
, which supposedly shows that it is better to have a lot of people who are slightly happy, than a few people who are very happy. Parfit calls this view "repugnant", but says he has not yet found a solution.
Philosophy
Philosophy is the study of general and fundamental problems, such as those connected with existence, knowledge, values, reason, mind, and language. Philosophy is distinguished from other ways of addressing such problems by its critical, generally systematic approach and its reliance on rational...
work by Derek Parfit
Derek Parfit
Derek Parfit is a British philosopher who specializes in problems of personal identity, rationality and ethics, and the relations between them. His 1984 book Reasons and Persons has been very influential...
, first published in 1984. It focuses on ethics
Ethics
Ethics, also known as moral philosophy, is a branch of philosophy that addresses questions about morality—that is, concepts such as good and evil, right and wrong, virtue and vice, justice and crime, etc.Major branches of ethics include:...
, rationality
Rationality
In philosophy, rationality is the exercise of reason. It is the manner in which people derive conclusions when considering things deliberately. It also refers to the conformity of one's beliefs with one's reasons for belief, or with one's actions with one's reasons for action...
and personal identity.
It is divided into four parts, dedicated to self-defeating theories, rationality and time, personal identity and responsibility toward future generations.
Self-defeating theories
Part 1 argues that certain ethical theories are self-defeating. One such theory is ethical egoismEthical egoism
Ethical egoism is the normative ethical position that moral agents ought to do what is in their own self-interest. It differs from psychological egoism, which claims that people can only act in their self-interest. Ethical egoism also differs from rational egoism, which holds merely that it is...
, which Parfit claims fails due to the Prisoner's dilemma
Prisoner's dilemma
The prisoner’s dilemma is a canonical example of a game, analyzed in game theory that shows why two individuals might not cooperate, even if it appears that it is in their best interest to do so. It was originally framed by Merrill Flood and Melvin Dresher working at RAND in 1950. Albert W...
.
Ultimately, Parfit rejects "common sense morality" on similar grounds. Parfit himself does not explicitly endorse a particular view; rather, he shows what the problems of different theories are. His only positive endorsement is of "impersonal ethics" — impersonality being the common denominator of the different parts of the book.
Rationality and time
Part 2 focuses on the relationship between rationalityRationality
In philosophy, rationality is the exercise of reason. It is the manner in which people derive conclusions when considering things deliberately. It also refers to the conformity of one's beliefs with one's reasons for belief, or with one's actions with one's reasons for action...
and time
Time
Time is a part of the measuring system used to sequence events, to compare the durations of events and the intervals between them, and to quantify rates of change such as the motions of objects....
, dealing with questions such as: should we take into account our past desires?, should I do something I will regret later, even if it seems a good idea now?, and so on.
One of Parfit's arguments is as follows: self-interest theorists consider the differences between different persons at the same time as significant in terms of rationality, but do not consider the difference between the same person at the different times to be as significant. But if, as Parfit argues, a reductionist theory of personal identity holds, then the difference between different persons at the same time is more like the difference between the same persons at different times. So, if non-reductionism is true, self-interest
Individualism
Individualism is the moral stance, political philosophy, ideology, or social outlook that stresses "the moral worth of the individual". Individualists promote the exercise of one's goals and desires and so value independence and self-reliance while opposing most external interference upon one's own...
theorists are inconsistent in viewing spatial relations as significant but temporal relations insignificant. Thus, the foundations of the self-interest theory are undermined by non-reductionism, which lends support to the present-aim theory of rationality, the critical version of which Parfit favours.
Personal identity
Part 3 argues for a reductive account of personal identity; rather than accepting the claim that our existence is a deep, significant fact about the world, Parfit's account of personal identity is like this:At time 1, there is a person. At a later time 2, there is a person. These people seem to be the same person. Indeed, these people share memories and personality traits. But there are no further facts in the world that make them the same person.
Parfit continues this logic to establish a new context for morality and social control. He cites that it is morally wrong for one person to harm or interfere with another person and it is incumbent on society to protect individuals from such transgressions. That accepted, it is a short extrapolation to conclude that it is also incumbent on society to protect an individual's "Future Self" from such transgressions; tobacco use could be classified as an abuse of a Future Self's right to a healthy existence. Parfit resolves the logic to reach this conclusion, which appears to justify incursion into personal freedoms, but he does not explicitly endorse such invasive control.
Parfit's argument for this position relies on our intuitions regarding thought experiment
Thought experiment
A thought experiment or Gedankenexperiment considers some hypothesis, theory, or principle for the purpose of thinking through its consequences...
s such as teleportation
Teleportation
Teleportation is the fictional or imagined process by which matter is instantaneously transferred from one place to another.Teleportation may also refer to:*Quantum teleportation, a method of transmitting quantum data...
, the fission and fusion of persons, gradual replacement of the matter in one's brain, gradual alteration of one's psychology, and so on.
Parfit's conclusion is similar to 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...
's view, and also to the view of the self in Buddhism
Buddhism
Buddhism is a religion and philosophy encompassing a variety of traditions, beliefs and practices, largely based on teachings attributed to Siddhartha Gautama, commonly known as the Buddha . The Buddha lived and taught in the northeastern Indian subcontinent some time between the 6th and 4th...
, though it does not restrict itself to a mere reformulation of them. For besides being reductive, Parfit's view is also deflationary: in the end, "what matters" is not personal identity, but rather mental continuity and connectedness.
Future generations
Part 4 deals with questions of our responsibility towards future generations. It raises questions about whether it can be wrong to create a life, whether environmental destruction violates the rights of future people, and so on.One question Parfit raises is this: given that the course of history drastically affects what people are actually born (since it affects which potential parents actually meet and have children; and also, a difference in the time of conception will alter the genetic makeup of the child), do future persons have a right to complain about our actions, since they likely wouldn't exist if things had been different?
Another problem Parfit looks at is the mere addition paradox
Mere addition paradox
The mere addition paradox is a problem in ethics, identified by Derek Parfit, and appearing in his book, Reasons and Persons . The paradox identifies apparent inconsistency between three seemingly true beliefs about population ethics by arguing that utilitarianism leads to an apparent overpopulated...
, which supposedly shows that it is better to have a lot of people who are slightly happy, than a few people who are very happy. Parfit calls this view "repugnant", but says he has not yet found a solution.
External links
- Reasons and Persons at Oxford Scholarship Online.