What is No flies fly into a closed mouth mean in before we were free?

In "Before We Were Free" by Julia Alvarez, the phrase "No flies fly into a closed mouth" symbolizes the importance of silence and discretion in a repressive environment. It suggests that by remaining quiet and not speaking out, one can avoid attracting danger or scrutiny from authorities. This idea reflects the broader themes of oppression and the struggle for personal freedom in the context of the Dominican Republic's political turmoil. Ultimately, it underscores the tension between the desire for self-expression and the need for safety.