Further, indulging in thoughts of hate, resentment, ill-will, fear, worry, care, grief, and anxiety, produces ill-health, and, by lowering the tone of the body, lays it open to infection and disease. We therefore see that the state of the mind and the character of the thoughts are important factors which cannot be ignored. It is useless to treat either ill-health or disease if they are merely the external _effects_ of hidden causes of the mind. In order to effect a cure we have to get back to the cause of the trouble. Thought control [8] is a great assistance. Substituting a right or positive thought for a wrong one, will, in course of time, work wonders in the life. In the sub-conscious we have an illimitable power of extraordinary intelligence. According to our thoughts this wonderful power either builds up health, harmony and beauty in our life and body, or just the reverse. The power is good, the intelligence is apparently infinite, but it goes where-ever our thoughts direct it. By our thinking, therefore, we either create or destroy, produce either good or evil. If, therefore, all our thoughts are good, positive and constructive, it follows that both our body and our life must become built up in harmony and perfection. The question is, can this be done? It can be done if we have the desire, and are willing to discipline ourselves and persevere in the face, often, of seeming failure. Some readers may say, at this point, that they have no desire to be so frightfully good, that they are not prepared to give up lust, impurity, hate, anger, malice and thoughts and emotions of this kind. Very well, if this is so, they must go on and learn, through suffering, the lesson which they refuse to learn willingly. Others may say: "Yes, I want to control my thoughts, but how can I cease to worry when I have so much about which to worry, and how can I cease to hate when I have been so deeply wronged?" This brings us to an even deeper cause of ill-health than that of mind, viz., the attitude of the heart. Our scriptures tell us that "as a man thinketh in his _heart_ so is he." By "heart" is meant the soul or feeling, desiring part of man. It is here where the conflict between the self-will and the Divine Will, between the desires of the flesh and the longings of the Spirit take place. The real root cause of all unhappiness, disharmony and ill-health is spiritual, and not merely mental or physical. The latter are contributory causes, but the former is the fundamental cause. Spiritual disharmony is, in reality, the cause of all ill-health and disease. Until spiritual harmony is restored, man is a kingdom divided against itself, which, as our Lord said, cannot stand. Healing, then, must be of a spiritual character. Until this harmony exists there can be no overcoming of hate thoughts, fear thoughts or worry thoughts, and until these are overcome there can be no true healing. Our Lord's healing was a gracious healing of the Spirit.