A Course in Wonders, usually abbreviated as ACIM, is a profound and influential religious text that appeared in the latter half of the 20th century. Comprising over 1,200 pages, that extensive work is not really a book but an entire course in spiritual change and inner healing. A Course in Miracles is exclusive in their method of spirituality, drawing from numerous spiritual and metaphysical traditions to provide a system of believed that aims to lead persons to circumstances of internal peace, forgiveness, and awakening with their true nature.

The roots of A Class in Miracles may be tracked back to the relationship between two people, Helen Schucman and William Thetford, both of whom were prominent psychologists and researchers. The course's inception acim happened in early 1960s when Schucman, who had been a scientific and study psychologist at Columbia University's University of Physicians and Surgeons, started to have some inner dictations. She identified these dictations as originating from an inner voice that discovered it self as Jesus Christ. Schucman originally resisted these activities, but with Thetford's encouragement, she began transcribing the messages she received.

Around an amount of seven decades, Schucman transcribed what would become A Course in Wonders, amounting to three volumes: the Text, the Book for Students, and the Manual for Teachers. The Text sits out the theoretical base of the class, elaborating on the core concepts and principles. The Workbook for Students contains 365 classes, one for each time of the year, developed to steer the reader through a daily training of applying the course's teachings. The Manual for Teachers gives further advice on how best to understand and show the principles of A Program in Miracles to others.

One of many key themes of A Course in Miracles is the thought of forgiveness. The class teaches that true forgiveness is the key to internal peace and awareness to one's heavenly nature. Based on their teachings, forgiveness isn't simply a ethical or honest practice but a fundamental shift in perception. It requires making move of judgments, grievances, and the belief of crime, and as an alternative, seeing the planet and oneself through the lens of love and acceptance. A Program in Miracles highlights that correct forgiveness leads to the acceptance that we are interconnected and that separation from each other is an illusion.