A Proverb

I was thinking just now, there's this proverb that's very common in Swedish that I would like to apply to a short story in English, but I'm not sure whether it exists in any larger scale in English literature. It's an extremely minor matter, of course, but the core of the question is whether or not it is silly to say, "there's a Swedish proverb that says" or "Swedish people often say".

Either way, the proverb would roughly be translated as "don't throw stones in houses of glass" - släng inte sten i glashus. While it holds little meaning on its own, it's often used to tell people to be very careful, or to argue against an action that's rash and/or unthoughtful. However, I'm really only interested in the definition itself, as it ties together with the visual description. Is there any proverbs, or anything similar, to do with houses of glass?

What I thought of was if I was just restating a common proverb, but as I had never heard of such in English, I was unsure what to do. Obviously I didn't want to spout proverbs nobody's heard of. But yeah, it obviously exists (come to think of it, my sister was right; I have heard of it), so I won't point it out as solely a Swedish proverb. I might still do something like "The Swedish say", but then again I'm not sure whether I want to brand the thing with a Swedish setting in the first place.

Thanks anyway!

That is true, and it is an interesting idea. Only, I suppose, that the Swedish words look so ugly in my eyes. I never really came to peace with the whole "ä" thing...

Either way, I'll try it that way as well.