A Course in Miracles is a spiritual self-study program that is targeted on transforming the way people think about life, relationships, and reality. First published in 1976, the book presents an original spiritual philosophy devoted to love, forgiveness, and inner peace. It teaches that many of the problems people experience originate from fear, guilt, and separation in the mind. In accordance with its teachings, miracles aren't supernatural events but simple shifts in perception—from fear to love. The course encourages readers to improve how they see themselves and others for them to experience peace and clarity in everyday life.

The structure of the book is divided in to three main parts: the Text, the Workbook  a course in miracles for Students, and the Manual for Teachers. The Text explains the theory behind the spiritual ideas presented in the course. The Workbook contains 365 daily lessons designed to greatly help students practice new ways of thinking and perceiving the world. The Manual for Teachers answers common questions and explains how people can share these teachings with others. Together, these sections form a whole spiritual training program that aims to retrain your head to see the entire world through love rather than fear.

Among the central ideas in the course is forgiveness. However, the thought of forgiveness in this teaching is different from the standard meaning. As opposed to forgiving someone for doing something wrong, the course teaches that the perception of wrongdoing itself originates from misunderstanding and illusion. By recognizing that lots of judgments result from the ego or fear-based thinking, students learn to produce Anger, resentment, and blame. This process of forgiveness becomes a powerful tool for healing relationships and restoring inner peace.

Another key concept in the course could be the indisputable fact that the physical world people experience is influenced by their thoughts and perceptions. It suggests that lots of experiences of conflict and suffering come from believing in separation—separation from others, from love, and from a greater spiritual truth. Through practice and reflection, the course encourages individuals to question these beliefs and recognize a deeper spiritual reference to others. By changing the way the mind interprets events, people can experience greater peace and understanding.

The daily lessons in the workbook are a significant part of practicing the teachings. Each lesson centers around a particular idea, such as letting go of judgment, recognizing the energy of your head, or choosing love in place of fear. Students are encouraged to pay a few minutes daily reflecting on the lesson and applying it to real-life situations. With time, this practice helps shift mental habits and encourages a calmer, more compassionate outlook on life.