“The primary cause of diseases which afflict the body is bad thoughts. Whatever you hold in your mind will be produced in the physical body. Any ill-feeling or bitterness towards another person will at once affect the body and produce some kind of disease in the body. Intense passion, hatred, longstanding bitter jealousy, corroding anxiety, fits of hot temper actually destroy the cells of the body and induce disease of the heart, liver, kidneys, spleen and stomach. Violent fits of hot temper do serious damage to the brain cells, throw poisonous chemical products into the blood, produce general shock and depression and suppress the secretion of gastric juice, bile and other digestive juices in the alimentary canal, drain away your energy, vitality, induce premature old age and shorten life.
When the mind is agitated, then this body also is agitated. Wherever the body goes, the mind follows. When both the body and mind are agitated, the Prana flows in a wrong direction. Instead of pervading the whole body steadily and equally, it will vibrate at an unequal rate (unrhythmically). Then the food is not digested properly. Diseases originate. If the primary cause is removed, then all diseases will disappear.
The pains that afflict the physical body are called secondary diseases, whilst the Vasanas that affect the mind are termed mental or primary diseases. If bad thoughts are destroyed, all bodily diseases will vanish. Purity of mind means healthy body. Therefore, be careful in your thinking, in the selection of your thoughts. Always entertain noble, sublime, loving and kind thoughts. You will have harmony, health and beauty.”