[9급 국가직 영어 2008년 18번]

The saying for which I had to find the meaning was: “People who live in glass houses shouldn’t throw stones.”

(A) My first guess was that it was about a situation in which those who want to fight should first think about defending themselves from attack. Obviously, a person whose house is made of glass, which is easily broken, should be careful. If you throw a stone, the person at whom you threw the stone could throw it back and smash your house.

(B) I think this is good advice for anyone who is critical of other people.

(C) However, this saying, whose meaning I looked up in a dictionary of English idioms is not really about fighting. It means that you should not criticize others for faults similar to those you have.