All that glisters is not gold'This is a common saying we hear very frequently. Gold is very shiny and yellow in colour. There are many types of gold available. 1 Carat, 5 carat, 18 carat, 22 carat and 24 carat. By seeing them you can't say what is the percentage of gold. All will appear same. Don't judge by the appearance.
Similarly many people pretend to be good. They talk very nicely and behave friendly. But their intentions are different. So don't judge people by their appearance . You should understand them before we believe them. Otherwise we will be unnecessarily get deceived.