One of many central themes of ACIM is the concept of forgiveness. The Class teaches that forgiveness isn't merely pardoning some body for his or her wrongdoings, but alternatively, it is the recognition that there surely is nothing to forgive. It asserts that what we perceive as wrongdoings are eventually the consequence of our own misperceptions and projections. In forgiving the others, we are, in fact, forgiving ourselves. ACIM emphasizes that forgiveness is really a road to inner peace and liberation from the burdens of resentment and anger.

Still another essential principle of A Class in Wonders is the proven fact that the bodily world can be an illusion. It posits which our sensory experiences are unreliable indicators of truth and that correct belief can just only be performed through a shift in consciousness. The Program distinguishes between the "real-world," which is a state of peace and oneness beyond the a course in miracles world, and the "ego earth," characterized by anxiety, separation, and conflict. Based on ACIM, our principal function is to awaken from the desire of the pride world and come back to the attention of our divine nature.

ACIM also introduces the notion of the Holy Spirit as helpful tips and instructor within the individual. This religious existence sometimes appears as the foundation of enthusiasm and knowledge, helping people produce choices that lead us closer to truth and far from illusion. The Program teaches that through our willingness to hear the Holy Spirit's guidance, we are able to access a deeper understanding of our purpose and the path to healing.

The Book for Students in A Class in Miracles includes 365 classes, one for each time of the year. These classes are designed to help students internalize the teachings and apply them for their everyday lives. They often include meditative and contemplative exercises, affirmations, and reflections on the concepts presented in the text. The objective of these everyday instructions would be to shift the student's perception and attitude slowly, primary them towards a situation of correct forgiveness, internal peace, and religious awakening.