A Course in Wonders, often abbreviated as ACIM, is a profound and influential spiritual text that surfaced in the latter half of the 20th century. Comprising over 1,200 pages, that comprehensive work is not just a guide but a complete class in religious change and inner healing. A Program in Miracles is unique in their way of spirituality, drawing from various spiritual and metaphysical traditions to provide a system of thought that seeks to lead people to circumstances of inner peace, forgiveness, and awareness with their true nature.

The sources of A Course in Wonders may be tracked back once again to the collaboration between two persons, Helen Schucman and William Thetford, both of whom were distinguished psychologists and researchers. The course's inception happened in early 1960s when Schucman, who was a scientific and study psychiatrist at Columbia University's College of Physicians and Surgeons, began to have a series of internal dictations. She identified these dictations as originating from an internal voice that identified itself as Jesus Christ. Schucman originally resisted these activities, but with Thetford's encouragement, she started transcribing the communications she received.

Around a period of eight years, Schucman transcribed what can become A Class in Wonders, amounting to three volumes: the Text, the Workbook for Pupils, and the Information for Teachers. The Text lays out the theoretical acim of the program, elaborating on the core concepts and principles. The Workbook for Students includes 365 instructions, one for each day of the year, designed to steer the reader through a day-to-day practice of using the course's teachings. The Manual for Educators provides further guidance on how to realize and train the concepts of A Program in Wonders to others.

Among the main styles of A Course in Wonders is the idea of forgiveness. The program shows that true forgiveness is the important thing to inner peace and awakening to one's divine nature. Based on their teachings, forgiveness is not simply a moral or honest practice but a elementary change in perception. It requires allowing go of judgments, issues, and the understanding of crime, and instead, viewing the entire world and oneself through the contact of love and acceptance. A Program in Miracles stresses that true forgiveness contributes to the acceptance that we are interconnected and that separation from each other is an illusion.