Your body is your objectified thought. When your thoughts change, the body will also change. The mind creates the body from the material of your own thoughts. Thought is a force that can change, transform, or at least modify, almost anything in the human system.
The disorder and disharmony of the physical body is called a physical disease and the conflict of the mind is called a mental disease. Both of them have their ultimate root in ignorance and can be cured only by the knowledge of reality. When you worry about the experiences of the world, a depressing mental disturbance originates in your mind. By the effect of mental disturbance, the smooth and regular flow of vital currents is disturbed. When the vital currents flow improperly, the nadis become disorganized. Some of them get more vital energy and some get less. Thus, the whole system gets out of order. In this way mental disharmony is the cause of physical diseases, which can be cured only by removing the cause.
Every depressing and disturbing thought that enters your brain has a depressing effect on every cell of your body, and tends to produce disease. All negative thoughts are forerunners of disease, and they are messengers of death. If you want to live long and lead a sensible and healthy life, cherish good thoughts. Subtle and powerful are influences of the thoughts in building and rebuilding your body. Be vigilant.
Practically all diseases with their sufferings have their origin in perverted mental and emotional states and conditions. Restoration of mental harmony is absolutely necessary for you. Purify your thoughts by performing noble actions and by association with wise ones. When your thoughts are purified the vital currents will begin to flow properly and will clean the whole system. Every good thought stimulates the heart, improves the digestive system and promotes the normal action of every gland.
Contentment is another name for the harmony of the mind. When your thoughts do not wander to this or that object, and when you feel self-satisfied, you are in a state of joy which is unique. If you are happy within, everything appears good and pleasing to you.
Thoughts are the main source of your cheerfulness. Purify your thoughts; all troubles will be cured. If you are cherishing peaceful thoughts the whole world will appear cool, but if negative thoughts have spread their kingdom then the world will seem to be a hot furnace. No circumstance compels you to cherish bad thoughts. Do not ruin yourself by your imagination of fate. It has no reality of its own.
Change of thought, relaxation of mind by dwelling on thoughts of pleasant objects, cheerfulness, sattwic food and mental recreation of a sattwic nature are necessary for mental health. The mind assumes the shape of any object it intently thinks of. If it thinks of an orange it assumes the shape of an orange. If it thinks of Lord Jesus on the Cross it assumes the shape of Lord Jesus on the Cross. You must train the mind properly and give it proper pure food for assimilation.
Have a divine background of thought or mental image. If all the thoughts are eliminated, then there remains nothing which can be called mind. So thoughts are the mind. Again there is no such thing as world, independent of and apart from thoughts. Two thoughts, however, closely related to one another, cannot exist at the same time.
The mind becomes that on which it dwells. This is an immutable psychological law. If you begin to think about the dosha or defects of a man, for the time being at least your mind dwells on the bad qualities and becomes charged with these qualities, whether the man possesses these bad qualities or not. This may be your vain imagination only through your wrong thinking, wrong samskaras or wrong, bad habits of the mind. He may not possess even a bit of the bad qualities which you have superimposed on him through ill-will, some form of jealousy, petty-mindedness or habitual fault-finding nature. Therefore, give up the dangerous habit of censuring others and finding fault in others.
Praise others. Develop the power or vision of finding only good in others. You will be liked, honoured and respected by others. Do not bark like a wild dog about the bad qualities of others. Glorify others and you will grow spiritually.