In "The House of Unexpected Sisters" by Alexander McCall Smith, the theme of maintaining one's composure and integrity is explored through the challenges faced by the characters. The quote "It is very difficult sometimes to keep upright" reflects the struggles individuals encounter in their lives, emphasizing that staying true to oneself can be a demanding task amid life's complexities.

This sentiment resonates with the experiences of the characters, who navigate personal dilemmas and societal expectations. Their journeys illustrate the idea that while it may be tough to remain steadfast, perseverance and resilience are essential for overcoming obstacles and achieving personal growth.