The lesson this proverb teaches is that people whose own conduct is open to
criticism should not criticise the conduct of other’s who may retaliate by
accusing their accusers.

> ‘When are you going to return that book I lent you over a month ago? It’s
downright dishonest to keep it so long.’

> ‘What about the one you borrowed from me early last year?’

> ‘I’m sorry. I’d forgotten all about that one.’

> ‘People who live in glass houses shouldn’t throw stones.’