These are the two essentials to thinking in the Certain Way which will make you well: first, claim or appropriate health by faith; and, second, sever all mental relations with disease, and enter into mental relations with health. That which we make ourselves, mentally, we become physically; and that with which we unite ourselves mentally we become unified with physically. If your thought always relates you to disease, then your thought becomes a fixed power to cause disease within you; and if your thought always relates you to health, then your thought becomes a fixed power exerted to keep you well. In the case of the people who are healed by medicines, the result is obtained in the same way. They have, consciously or unconsciously, sufficient faith in the means used to cause them to sever mental relations with disease and enter into mental relations with health. Faith may be unconscious. It is possible for us to have a sub-conscious or inbred faith in things like medicine, in which we do not believe to any extent objectively; and this sub-conscious faith may be quite sufficient to quicken the Principle of Health into constructive activity. Many who have little conscious faith are healed in this way; while many others who have great faith in the means are not healed because they do not make the personal application to themselves; their faith is general, but not specific for their own cases. In the Science of Being Well we have two main points to consider: first, how to think with faith; and, second, how to so apply the thought to ourselves as to quicken the Principle of Health into constructive activity. We begin by learning What to Think. CHAPTER IV. WHAT TO THINK. In order to sever all mental relations with disease, you must enter into mental relations with health, making the process positive not negative; one of assumption, not of rejection. You are to receive or appropriate health rather than to reject and deny disease. Denying disease accomplishes next to nothing; it does little good to cast out the devil and leave the house vacant, for he will presently return with others worse than himself. When you enter into full and constant mental relations with health, you must of necessity cease all relationship with disease. The first step in the Science of Being Well is, then, to enter into complete thought connection with health. The best way to do this is to form a mental image or picture of yourself as being well, imagining a perfectly strong and healthy body; and to spend sufficient time in contemplating this image to make it your habitual thought of yourself.