Where is Ethos Two Languages in Mind but Just One the Heart Louise Erdrich?

The phrase "Two Languages in Mind but Just One the Heart" is not a direct quote from any of Louise Erdrich's works, including her novel "The Round House."

It's possible you're misremembering a passage or that the quote is from a different source.

If you can provide more context about where you encountered this phrase, I might be able to help you identify the source.