The quote reflects the idea that darkness and difficult times are temporary, emphasizing that there is a light at the end of the tunnel. It uses the analogy of rhubarb, which requires a period of darkness to flourish, suggesting that sometimes we need to endure challenging phases in life for growth and eventual success.

In the context of the book "Finding Audrey" by Sophie Kinsella, this metaphor illustrates the importance of patience and self-care during tough situations. Just like the rhubarb requires a nurturing environment away from light, individuals may also need time to heal and develop before they can emerge stronger and more vibrant.