"You don't borrow trouble" is a phrase that suggests one should not invite or create unnecessary problems in their life. It emphasizes the importance of focusing on the present and dealing with issues as they arise, rather than worrying about potential troubles that may never occur. This mindset encourages individuals to deal with life’s challenges pragmatically instead of dwelling on hypothetical fears.

In Jodi Picoult's novel "Picture Perfect," this advice resonates with the characters as they navigate complex situations. The theme addresses the significance of living in the moment and confronting reality directly, rather than creating additional stress by overthinking possible adversities. The message serves as a reminder to prioritize mental well-being and maintain perspective amidst life's unpredictability.