In "The Problem with Forever" by Jennifer L. Armentrout, the theme of the fleeting nature of life is poignantly explored. The quote "Life can be all too brief" encapsulates the central message that time is precious and can pass by quickly. This notion encourages characters and readers alike to appreciate each moment, embrace their experiences, and engage fully in their relationships and personal growth.

The novel highlights the struggles and fears of the protagonist as she navigates her challenges while learning to cherish the life she has. It emphasizes that despite the difficulties faced, making the most of every day is essential, reinforcing the idea that life, though brief, is filled with opportunities for connection and self-discovery.