The quote "We must be magnetic" suggests that individuals should focus on attracting opportunities and adventures into their lives. It emphasizes the importance of a positive and inviting attitude that draws exciting experiences closer. Being magnetic can lead to personal growth, new friendships, and unforgettable journeys.

In the context of the book "Mystery in the Sand" by Gertrude Chandler Warner, this quote resonates with the adventurous spirit of the characters. As they embark on their quests, their ability to attract and embrace challenges reflects the inherent excitement of life's mysteries waiting to be discovered.