"Are we truly free?" This is a timeless question for all people, regardless of language, religion, and culture. Christianity offers its own answers to this question, based on both the Bible and philosophy.

This study systematically presents the views of Saint John of Damascus (676-749) on the concept of free will. Specifically, it attempts to answer questions related to the free will of God, Christ, angels and demons, creation and animals, and especially humans. Among other things, it presents John of Damascus' answers to the questions: "What are the limits and proper use of free will, and what are the consequences?", "What does it mean that man is created in the image and likeness of God?", "What is sin and what is hell?", "Is God a punisher?", "Does the devil have power over man and creation?", "What is the difference between foreknowledge and predestination?", "What are the causes of evil, decay, and death, and what is the possibility of overcoming them?"

The reason the author chose Saint John of Damascus is because he is one of the foremost historical and systematic theologians of the Christian Church's doctrine, who essentially summarizes the tradition before him in a dynamic way and thus provides a clear and comprehensive picture of the development and formation of Christian theology.