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The role of teaching and learning is actually reversed in the thinking of the world. the reversal is characteristic. It seems as if the teacher and the learner are separated, the teacher giving something to the learner rather than to himself. Further, the act of teaching is regarded as a special activity, in which one engages only a relatively small proportion of one's time. The course, on the other hand, emphasizes that to teach is to learn, so that teacher and learner are the same. It also emphasizes that teaching is a constant process; it goes on every moment of the day, and continues into sleeping thoughts as well.

To teach is to demonstrate. There are only two thought systems, and you demonstrate that you believe one or the other is true all the time. From your demonstration others learn, and so do you. the question is not whether you will teach, for in that there is no choice. the purpose of the course might be said to provide you with a means of choosing what you want to teach on the basis of what you want ot learn. You cannot give to someone else, but only to yourself, and this you learn through teaching. Teaching is but a call to witnesses to attest to what you believe. It is a method of conversion. this is not done by words alone. Any situation must be to you a chance to teach others what you are, and what they are to you. No more than that, but also never less.

Introduction, A Course In Miracles.