The proverb literally means that those people who are living in houses made of glasses should not throw stones at others. This is because when you throw from glasshouses, you are nowhere on the safer side. When the other person starts throwing the stone at you, your house and everything you own get destroyed instantly. Your action will end up destroying you ultimately. This has a symbolic meaning towards our dealing with other persons. When you are at fault, you should not spot the faults of others. If you do so, you will end up in trouble. Those who “throw stones” at others to hurt them, can be thrown back to hurt themselves. When you say bad about others you are going to experience the same. That too, when you live in a “glass house” it will be easier for them to hurt you with your faults by throwing the same stones at you.