We really want to do an excellent job teaching and entertaining our audience . So , we try to do this program as best we can every time . But sometimes we make mistakes . Making a mistake is not pleasant , but it is natural . One well-known saying begins , “To err is human …” In other words , making mistakes is part of being a person . But what about those who suffer because of someone else's mistake ? The saying answers this question , too . That means that excusing others for their faults makes us a little better than just being human . The act is god-like . This popular saying is an old one . It comes from the 18th century English poet Alexander Pope . He wrote about forgiveness in an essay titled "An Essay on Criticism ." "Err " comes from the Latin word "errare ,” meaning “to stray or wander .” Related words , such as errant and erroneous , have the same Latin origin . But the noun form of “err ,” error , appears in many American English expressions . For example , human error is often the reason police give for a preventable – but unplanned – accident . If a train crashes because the driver fell asleep , that crash was caused by human error . But some errors or mistakes are nobody's fault directly . Let's say a plane crashes . An investigation proves that the crash was caused by an undetectable engine problem . There was nothing the pilot could have done differently to prevent the crash . In this case , the cause of the crash was not pilot error . But that is enough talk about crashes . Let's say this pilot is on the runway preparing to take off . Suddenly , a bad storm begins . She could take off but decides to wait until the storm passes . We could say she wants to err on the side of caution . This simply means that of all the options available , you choose the safest one . If you feel sick one day but feel fine the next , you may err on the side of caution and stay home from work . You can err on the side of other things . For example , let's say your child's school asks for a money donation to build a new playground . You don't know how much other parents are giving . So , you err on the side of generosity and give more than you think is expected . Here's another example . If a person has treated you badly in the past , you can err on the side of being polite to them . Acting politely is the right thing to do . And it's good for another reason , as well . When you are nice to people who have treated you badly in the past , they may re-think their bad behavior . They may see the error of their ways . We often use this phrase when we want to say that a person has realized the things they have done wrong . But be warned – we don't use this phrase lightly . The "error " in this expression is usually a serious problem with a person's character or behavior that may cause trouble . This expression also means the person became aware and then fixed the problem . Let's go back to the pilot . Imagine she had a bad habit of working too hard . She would lie about her long flight assignments so that she could fly even more routes . However , one day she realized that she was putting the passengers in danger . She saw the error of her ways and stopped . If her supervisor had caught her and forced her to change her work habits , you would not use this expression . And you would not say the supervisor saw the error in her ways . Now , talking about self-discovery brings us to scientific discoveries . Scientists are very careful people , but scientific research is full of errors . Scientists know this . So , they sometimes say that their findings have a margin of error . That margin , or amount , shows how accurate they think their answer really is . You can also add prepositions to this expression . For example , if something is unlikely to happen based on information you have collected about it , it is outside the margin of error . If it is likely to happen , it is within the margin of error . Another scientific term that we use in any part of our lives is trial and error . Trial and error means you find the best way to do something by trying many ways and getting rid of the ways that failed . Sometimes here at VOA , creating new programs for our listeners involves some trial and error . Sure , it is helpful to know which programs in the past were popular . But times change and so do audiences . We need to be willing to try new things -- that's the trial part -- and fail , or make an error . If we do fail , I hope you will err on the side of forgiveness and give us another chance . I'm Jonathan Evans …