The body is internally associated with the mind, rather the body is a counterpart of the
mind; it is a gross visible form of the subtle, invisible mind. If there is pain in the tooth or in the stomach or in the ear, the mind is at once affected. It ceases to think properly; it is agitated, disturbed and perturbed.
 
If there is depression in the mind, the body also cannot function properly. The pains
which afflict the body are called the secondary diseases, Vyadhi, while the Vasanas or desires that afflict the mind are termed mental or primary diseases, Adhi.
Mental health is more important than physical health. If the mind is healthy, the body will
necessarily be healthy. If the mind is pure, if your thoughts are pure, you will be free from all diseases primary and secondary. “Mens sana in corpore sano—a sound mind in a sound body.”