Why did Stanley keep his mouth shut most of the time in the book Holes by Louis Sachar?

In "Holes" by Louis Sachar, Stanley Yelnats often keeps his mouth shut to avoid drawing attention to himself and to prevent further bullying or conflict, particularly from his peers at Camp Green Lake. His quiet demeanor also reflects a sense of resignation to his unfortunate circumstances and a desire to stay out of trouble. Additionally, Stanley's introspective nature allows him to think deeply about his family's history and his own situation, leading him to choose silence over unnecessary confrontation.