people in glass houses

[DONNA1458]

I remember my teacher explaining the meaning but many years ago now ! could anyone explain.

[Houdi]

People who live in glass houses shouldn't throw stones because they might get those stones thrown right back at them.

In other word, don't critisise someone else for something that you are guilty of yourself.

[Clanad]

In addition to Houdi's explanation, this is enlightening as well: "The proverb has been traced back to Geoffrey Chaucer's 'Troilus and Criseyde' (1385). George Herbert wrote in 1651: 'Whose house is of glass, must not throw stones at another.' This saying is first cited in the United States in 'William & Mary College Quarterly' (1710). Twenty-six later Benjamin Franklin wrote, 'Don't throw stones at your neighbors', if your own windows are glass.' 'To live in a glass house' is used as a figure of speech referring to vulnerability." [From "Random House Dictionary of Popular Proverbs and Sayings" (1996) by Gregory Y. Titelman (Random House, New York, 1996).]