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This is a very famous English proverb that we hear from childhood. It actually means about the inner darkness of humans. Gold is a very valuable thing and it glitters always. But there are lots of other similar stones or things like gold which glitters like gold. But they are not gold. Like this, there are so many attractive and beautiful people around. Actually, they are not good. Some of them are really evil inside. We have to understand the inner motive or desire of someone. We shouldn’t judge someone with outer appearance.