The sources of A Class in Miracles could be tracked back to the relationship between two people, Helen Schucman and William Thetford, equally of whom were distinguished psychologists and researchers. The course's inception occurred in the early 1960s when Schucman, who had been a scientific and study psychiatrist at Columbia University's College of Physicians and Surgeons, started to have a series of internal dictations. She explained these dictations as coming from an interior voice that discovered itself as Jesus Christ. Schucman originally resisted these activities, but with Thetford's support, she started transcribing the messages she received.

Over an amount of seven years, Schucman transcribed what can become A Class in Wonders, amounting to three quantities: the Text, the Workbook for Pupils, and the Manual for Teachers. The Text lies out the theoretical basis of the class, elaborating on the core methods and principles. The Book for Students contains 365 instructions, one for every time of the year, developed to steer the reader by way of a day-to-day training of using the course's teachings. The Information for Educators gives more guidance on how to realize and show the axioms of A Program in Wonders to others.

One of the main themes of A Program in Wonders is the idea of forgiveness. The class teaches that true forgiveness is the acim to inner peace and awareness to one's divine nature. According to its teachings, forgiveness is not only a moral or moral exercise but a simple shift in perception. It involves making go of judgments, grievances, and the perception of sin, and instead, seeing the entire world and oneself through the contact of love and acceptance. A Course in Miracles highlights that true forgiveness leads to the acceptance that people are all interconnected and that separation from one another is an illusion.

Yet another significant aspect of A Class in Wonders is their metaphysical foundation. The class presents a dualistic view of reality, distinguishing involving the ego, which represents divorce, concern, and illusions, and the Holy Spirit, which symbolizes love, truth, and religious guidance. It suggests that the ego is the source of suffering and struggle, as the Holy Heart provides a pathway to therapeutic and awakening. The goal of the course is to simply help individuals transcend the ego's confined perspective and arrange with the Holy Spirit's guidance.