Be cheerful always
By H H Swami Sivanandaji Maharaj
Reference/Source: The Divine Life Society
“Mind can cure all the physical diseases of the body by its harmonious and healthy divine thoughts, because all physical diseases have taken their origin in mental ill-health. Lack of cheerfulness contributes to physical ill-health. If one is always cheerful and entertains good, divine thoughts, he will have perfect health at all times. It is in your power to continue well and young as long as you like.”
Gurudev had said this in the late 1950s. In my humble opinion, who would know this better but Gurudev, a very successful MBBS medical doctor, He left everything at the peak of his career in the 1920s and dedicated his life in the spiritual service of people, by the banks of the river Ganges in Rishikesh, till he attained mahasamadhi in 1963.