One of the central ideas in "Let Go Now" is the concept of detachment. Casey emphasizes that by letting go of the need to control others and their actions, individuals can achieve a sense of freedom and balance in their lives. This idea is crucial for those struggling with codependence, as it helps them focus on their own well-being rather than being consumed by the problems of others.

Another key idea in the book is the importance of setting boundaries. Casey provides practical advice on how to establish and maintain healthy boundaries in relationships. By doing so, individuals can protect their emotional health and prevent themselves from becoming enmeshed in the issues of others. This idea is essential for anyone looking to create healthier and more fulfilling relationships.

"Let Go Now" also highlights the significance of self-care and personal growth. Casey encourages readers to prioritize their own needs and take steps towards self-improvement. This idea is particularly important for those recovering from codependence, as it helps them shift their focus from taking care of others to taking care of themselves. By embracing self-care, individuals can achieve greater emotional and mental well-being.