In Ian McEwan's novel "Sweet Tooth," the author explores the unpredictable nature of love, illustrating that it doesn't develop linearly. Instead, love experiences sudden and intense growth spurts, reminiscent of unpredictable forces that propel it forward. This notion suggests that love can be both exhilarating and daunting, taking individuals by surprise with its intensity.

The quote encapsulates the idea that while love can be turbulent and erratic, these moments of rapid change are vital to its evolution. Such shifts can redefine relationships, making them deeper and more meaningful as they navigate through unexpected challenges and emotions.