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Introduction to Philosophy

5.3 Arguments

Introduction to Philosophy5.3 Arguments
Table of contents
  1. Preface
  2. 1 Introduction to Philosophy
    1. Introduction
    2. 1.1 What Is Philosophy?
    3. 1.2 How Do Philosophers Arrive at Truth?
    4. 1.3 Socrates as a Paradigmatic Historical Philosopher
    5. 1.4 An Overview of Contemporary Philosophy
    6. Summary
    7. Key Terms
    8. References
    9. Review Questions
    10. Further Reading
  3. 2 Critical Thinking, Research, Reading, and Writing
    1. Introduction
    2. 2.1 The Brain Is an Inference Machine
    3. 2.2 Overcoming Cognitive Biases and Engaging in Critical Reflection
    4. 2.3 Developing Good Habits of Mind
    5. 2.4 Gathering Information, Evaluating Sources, and Understanding Evidence
    6. 2.5 Reading Philosophy
    7. 2.6 Writing Philosophy Papers
    8. Summary
    9. Key Terms
    10. References
    11. Review Questions
    12. Further Reading
  4. 3 The Early History of Philosophy around the World
    1. Introduction
    2. 3.1 Indigenous Philosophy
    3. 3.2 Classical Indian Philosophy
    4. 3.3 Classical Chinese Philosophy
    5. Summary
    6. Key Terms
    7. References
    8. Review Questions
    9. Further Reading
  5. 4 The Emergence of Classical Philosophy
    1. Introduction
    2. 4.1 Historiography and the History of Philosophy
    3. 4.2 Classical Philosophy
    4. 4.3 Jewish, Christian, and Islamic Philosophy
    5. Summary
    6. Key Terms
    7. References
    8. Review Questions
    9. Further Reading
  6. 5 Logic and Reasoning
    1. Introduction
    2. 5.1 Philosophical Methods for Discovering Truth
    3. 5.2 Logical Statements
    4. 5.3 Arguments
    5. 5.4 Types of Inferences
    6. 5.5 Informal Fallacies
    7. Summary
    8. Key Terms
    9. References
    10. Review Questions
    11. Further Reading
  7. 6 Metaphysics
    1. Introduction
    2. 6.1 Substance
    3. 6.2 Self and Identity
    4. 6.3 Cosmology and the Existence of God
    5. 6.4 Free Will
    6. Summary
    7. Key Terms
    8. References
    9. Review Questions
    10. Further Reading
  8. 7 Epistemology
    1. Introduction
    2. 7.1 What Epistemology Studies
    3. 7.2 Knowledge
    4. 7.3 Justification
    5. 7.4 Skepticism
    6. 7.5 Applied Epistemology
    7. Summary
    8. Key Terms
    9. References
    10. Review Questions
    11. Further Reading
  9. 8 Value Theory
    1. Introduction
    2. 8.1 The Fact-Value Distinction
    3. 8.2 Basic Questions about Values
    4. 8.3 Metaethics
    5. 8.4 Well-Being
    6. 8.5 Aesthetics
    7. Summary
    8. Key Terms
    9. References
    10. Review Questions
    11. Further Reading
  10. 9 Normative Moral Theory
    1. Introduction
    2. 9.1 Requirements of a Normative Moral Theory
    3. 9.2 Consequentialism
    4. 9.3 Deontology
    5. 9.4 Virtue Ethics
    6. 9.5 Daoism
    7. 9.6 Feminist Theories of Ethics
    8. Summary
    9. Key Terms
    10. References
    11. Review Questions
    12. Further Reading
  11. 10 Applied Ethics
    1. Introduction
    2. 10.1 The Challenge of Bioethics
    3. 10.2 Environmental Ethics
    4. 10.3 Business Ethics and Emerging Technology
    5. Summary
    6. Key Terms
    7. References
    8. Review Questions
    9. Further Reading
  12. 11 Political Philosophy
    1. Introduction
    2. 11.1 Historical Perspectives on Government
    3. 11.2 Forms of Government
    4. 11.3 Political Legitimacy and Duty
    5. 11.4 Political Ideologies
    6. Summary
    7. Key Terms
    8. References
    9. Review Questions
    10. Further Reading
  13. 12 Contemporary Philosophies and Social Theories
    1. Introduction
    2. 12.1 Enlightenment Social Theory
    3. 12.2 The Marxist Solution
    4. 12.3 Continental Philosophy’s Challenge to Enlightenment Theories
    5. 12.4 The Frankfurt School
    6. 12.5 Postmodernism
    7. Summary
    8. Key Terms
    9. References
    10. Review Questions
  14. Index

Learning Objectives

By the end of this section, you will be able to:

  • Define key components of an argument.
  • Categorize components of sample arguments.
  • Explain the difference between assessing logic and assessing truth.

As explained at the beginning of the chapter, an argument in philosophy is simply a set of reasons offered in support of some conclusion. So an “arguer” is a person who offers reasons for a specific conclusion. Notice that the definition does not state that the reasons do support a conclusion (and rather states reasons are offered or meant to support a conclusion) because there are bad arguments in which reasons do not support a conclusion.

Arguments have two components: the conclusion and the reasons offered to support it. The conclusion is what an arguer wants people to believe. The reasons offered are called premises. Often philosophers will craft a numbered argument to make clear each individual claim (premise) given in support of the conclusion. Here is an example of a numbered argument:

  1. If someone lives in San Francisco, then they live in California.
  2. If someone lives in California, then they live in the United States.
  3. Hassan lives in San Francisco.
  4. Therefore, Hassan lives in the United States.

Getting to the Premises

The first step in understanding an argument is to identify the conclusion. Ask yourself what you think the main point or main idea is. Can you identify a thesis? Sometimes identifying the conclusion may involve a little bit of “mind reading.” You may have to ask yourself “What is this person trying to make me accept?” The arguer may use words that indicate a conclusion—for example, “therefore” or “hence” (see Table 5.1). After you have identified the conclusion, try to summarize it as well as you can. Then, identify the premises or evidence the arguer offers in support of that conclusion. Once again, identifying reasons can be tricky and might involve more mind reading because arguers don’t always explicitly state all of their reasons. Attempt to identify what you think the arguer wants you to accept as evidence. Sometimes arguers also use words that indicate that reasons or premises are being offered. In presenting evidence, people might use terms such as “because of” or “since” (see Table 5.1). Lastly, if it is difficult to first identify the conclusion of an argument, you may have to begin by parsing the evidence to then figure out the conclusion.

 

Conclusion indicator words and phrases therefore, hence, so, thus, consequently, accordingly, as a result, it follows that, it entails that, we can conclude, for this reason, it must be that, it has to be that
Premise indicator words and phrases given that, since, because, for, in that, for the reason that, in as much as, as indicated by, seeing how, seeing that, it follows from, owing to, it may be inferred from
Table 5.1 Navigating an Argument

Understanding evidence types can help you identify the premises being advanced for a conclusion. As discussed earlier in the chapter, philosophers will often offer definitions or conceptual claims in their arguments. For example, a premise may contain the conceptual claim that “The idea of God includes perfection.” Arguments can also contain as premises empirical evidence or information about the world gleaned through the senses. Principles are also used as premises in arguments. A principle is a general rule or law. Principles are as varied as fields of study and can exist in any domain. For example, “Do not use people merely as a means to an end” is an ethical principle.

Connections

See the introduction to philosopher chapter to learn more about conceptual analysis.

The Difference between Truth and Logic

Analysis of arguments ought to take place on the levels of both truth and logic. Truth analysis is the determination of whether statements are correct or accurate. On the other hand, logical analysis ascertains whether the premises of an argument support the conclusion.

Often, people focus solely on the truth of an argument, but in philosophy logical analysis is often treated as primary. One reason for this focus is that philosophy deals with subjects in which it is difficult to determine the truth: the nature of reality, the existence of God, or the demands of morality. Philosophers use logic and inference to get closer to the truth on these subjects, and they assume that an inconsistency in a position is evidence against its truth.

Logical Analysis

Because logic is the study of reasoning, logical analysis involves assessing reasoning. Sometimes an argument with a false conclusion uses good reasoning. Similarly, arguments with true conclusions can use terrible reasoning. Consider the following absurd argument:

  1. The battle of Hastings occurred in 1066.
  2. Tamaracks are deciduous conifer trees.
  3. Therefore, Paris is the capital of France.

The premises of the above argument are true, as is the conclusion. However, the argument is illogical because the premises do not support the conclusion. Indeed, the premises are unrelated to each other and to the conclusion. More specifically, the argument does not contain a clear inference or evidence of reasoning. An inference is a reasoning process that leads from one idea to another, through which we formulate conclusions. So in an argument, an inference is the movement from the premises to the conclusion, where the former provide support for the latter. The above argument does not contain a clear inference because it is uncertain how we are supposed to cognitively move from the premises to the conclusion. Neither the truth nor the falsity of the premises helps us reason toward the truth of the conclusion. Here is another absurd argument:

  1. If the moon is made of cheese, then mice vacation there.
  2. The moon is made of cheese.
  3. Therefore, mice vacation on the moon.

The premises of the above argument are false, as is the conclusion. However, the argument has strong reasoning because it contains a good inference. If the premises are true, then the conclusion does follow. Indeed, the argument uses a particular kind of inference—deductive inference—and good a deductive inference guarantees the truth of its conclusion as long as its premises are true.

The important thing to remember is that a good inference involves clear steps by which we can move from premise to premise to reach a conclusion. The basic method for testing the two common types of inferences—deductive and inductive—is to provisionally assume that their premises are true. Assuming a neutral stance in considering an inference is crucial to doing philosophy. You begin by assuming that the premises are true and then ask whether the conclusion logically follows, given the truth of those premises.

Truth Analysis

If the logic in an argument seems good, you next turn to assessing the truth of the premises. If you disagree with the conclusion or think it untrue, you must look for weaknesses (untruths) in the premises. If the evidence is empirical, check the facts. If the evidence is a principle, ask whether there are exceptions to the principle. If the evidence is a conceptual claim, think critically about whether the conceptual claim can be true, which often involves thinking critically about possible counterexamples to the claim.

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