CH05.qxd 10/16/07 1:45 PM Page 163 Constructing Knowledge 5 Beliefs Interpretations, evaluations, conclusions, and predictions about the world that we endorse as true Beliefs based on indirect experience (oral and written sources of information) Beliefs based on direct experience Evaluating indirect information: • How reliable is the information? • How reliable is the source of the information? Developing Knowledge by thinking critically about our beliefs Are the beliefs compelling Are the beliefs based and coherent explanations? on reliable sources? Are the beliefs Are the beliefs consistent with other Are the beliefs supported by beliefs and knowledge? accurate reasons and evidence? predictions? 163 © Houghton Mifflin CH05.qxd 10/16/07 1:45 PM Page 164 164 Chapter 5 Constructing Knowledge s your mind develops through your experiences and your reflection on these A experiences, your perceptions of the world should continue to develop as well. By thinking critically about your perceptions, by seeking to view the world from per- spectives other than your own and to comprehend the reasons that support these perspec- tives, you should find that your understanding of the world becomes increasingly more accurate and complete. As you have seen in the previous chapter, much of your knowl- edge of the world begins with perceiving. But to develop knowledge and understanding, you must use your thinking abilities to examine this experience critically. Increased understanding of the way the world operates thus increases the accuracy and complete- ness of your perceptions and leads you to informed beliefs about what is happening. Believing and Knowing The beliefs you develop help you explain why the world is the way it is, and they guide you in making decisions. But all beliefs are not equal. Some beliefs are certain (“I believe that someday I will die”) because they are supported by compelling rea- sons. Other beliefs are less certain (“I believe that life exists on other planets”) because the support is not as solid. As you form and revise your beliefs, based on your experiences and your reflection on these experiences, it is important to make them as accurate as possible. The more accurate your beliefs are, the better you are able to understand what is taking place and to predict what will occur in the future. The beliefs you form vary tremendously in accuracy. The idea of knowing is the ability to distinguish beliefs supported by strong reasons or evidence from beliefs for which there is less support, as well as from beliefs disproved by evidence to the contrary (such as the belief that the earth is flat). This distinction between “believ- ing” and “knowing” can be illustrated by replacing the word believe with the word know in statements. For example: 1. I know that I will die. 2. I know that there is life on other planets. 3. I know that working hard will lead me to a happy life. 4. I know that the earth is flat. The only statement with which most people would agree it clearly makes sense to use the word know is the first one because there is conclusive evidence that this belief is accurate. In the case of statement 2, we might say that, although life on other planets is a possibility, there does not seem to be conclusive evidence at pres- ent that supports this view. In the case of statement 3, we might say that, although for some people working hard leads to a happy life, this is not always the case. Statement 4 expresses a belief that we “know” is not true. In other words, when you say that “you know” something, you mean at least two different things: 1. I think this belief is completely accurate. 2. I can explain to you the reasons or evidence that support this belief. © Houghton Mifflin CH05.qxd 10/16/07 1:45 PM Page 165 Believing and Knowing 165 If either of these standards is not met, we would usually say that you do not really “know.” Or to state it another way, “You can believe what is not so, but you cannot know what is not so.” We work at evaluating the accuracy of our beliefs by examining the reasons or evidence that support them (known as the justification for the beliefs). As you learn more about the world and yourself, you try to form beliefs that are increasingly accurate and justified. Determining the accuracy and justification of your beliefs is challenging. The key point is that as a critical thinker, you should continually try to form and revise your beliefs so that you can understand the world in increasingly effective ways. Even when you find that you maintain certain beliefs over a long period of time, your explorations will result in a deeper and fuller understanding of these beliefs. Thinking Activity 5.1 EVALUATING THE ACCURACY OF BELIEFS State whether you think that each of the following beliefs is • Completely accurate (so that you would say, “I know this is the case”) • Generally accurate but not completely accurate (so that you would say, “This is often, but not always, the case”) • Generally not accurate but sometimes accurate (so that you would say, “This is usually not the case but is sometimes true”) • Definitely not accurate (so that you would say, “I know that this is not the case”) After determining the degree of accuracy in this way, explain why you have selected your answer. • Example: I believe that if you study hard, you will achieve good grades. • Degree of accuracy: Generally, but not completely, accurate. • Explanation: Although many students who study hard achieve good grades, this is not always true. Sometimes students have difficulty understanding the work in a certain subject, no matter how hard they study. And sometimes they just don’t know how to study effectively. In other cases, students may lack adequate background or experience in a certain subject area (for example, English may be a second language), or they may have a personality conflict with the instructor. 1. I believe that essay exams are more difficult than multiple-choice exams. 2. I believe that longer prison sentences discourage people from committing crimes. 3. I believe that there are more people on the earth today than there were 100 years ago. 4. I believe fate plays an important role in determining life’s events. © Houghton Mifflin CH05.qxd 10/16/07 1:45 PM Page 166 166 Chapter 5 Constructing Knowledge 5. I believe that people have the freedom to change themselves and their circum- stances if they really want to. Now write some of your most important beliefs on the following subjects and eval- uate them in the same way: • love • physical health • happiness • religion Knowledge and Truth Most people in our culture are socialized to believe that knowledge and truth are absolute and unchanging. One major goal of social institutions, including family, the school system, and religion, is to transfer the knowledge that has been devel- oped over the ages. Under this model, the role of learners is to absorb this infor- mation passively, like sponges. As you have seen in this text, achieving knowledge and truth is a complicated process. Instead of simply relying on the testimony of authorities like parents, teachers, textbooks, and religious leaders, critical thinkers have a responsibility to engage actively in the learning process and participate in developing their own understanding of the world. The need for this active approach to knowing is underscored by the fact that authorities often disagree about the true nature of a given situation or the best course of action. It is not uncommon, for example, for doctors to disagree about a diagno- sis, for economists to differ on the state of the economy, for researchers to present contrasting views on the best approach to curing cancer, for psychiatrists to disagree on whether a convicted felon is a menace to society or a harmless victim of social forces, and for religions to present conflicting approaches to achieving eternal life. What do we do when experts disagree? As a critical thinker, you must analyze and evaluate all the available information, develop your own well-reasoned beliefs, and recognize when you don’t have sufficient information to arrive at well-reasoned beliefs. You must realize that these beliefs may evolve over time as you gain infor- mation or improve your insight. Although there are compelling reasons to view knowledge and truth in this way, many people resist it. Either they take refuge in a belief in the absolute, unchanging nature of knowledge and truth, as presented by the appropriate authorities, or they con- clude that there is no such thing as knowledge or truth and that trying to seek either is a futile enterprise. Some beliefs are better than others, not because an authority has pro- claimed them so but because they can be analyzed in terms of the following criteria: • How effectively do your beliefs explain what is taking place? • To what extent are these beliefs consistent with other beliefs you have about the world? • How effectively do your beliefs help you predict what will happen in the future? • To what extent are your beliefs supported by sound reasons and compelling evidence derived from reliable sources? © Houghton Mifflin CH05.qxd 10/16/07 1:45 PM Page 167 Knowledge and Truth 167 Another important criterion for evaluating your beliefs is that the beliefs are falsifi- able. This means that you can state conditions—tests—under which the beliefs could be disproved and the beliefs nevertheless pass those tests. For example, if you believe that you can create ice cubes by placing water-filled trays in a freezer, it is easy to see how you can conduct an experiment to determine if your belief is accu- rate.