Foundation of Ayurveda
The gross physical body is a manifestation of the subtle energy field of prana, without which we could not even move. Physical imbalances are merely the reflection of earlier imbalances in the pranic field
Without Prana nothing is possible.
"All that exists in the three heavens rests in the control of Prana. As a mother her children, oh Prana, protect us and give us splendor and wisdom."
(Prashna Upanishad II.13)
There is an old Vedic story about Prana that we find in various Upanishads. The five main faculties of our nature - the mind, breath (prana), speech, ear and eye - were arguing with each other as to which one of them was the best and most important. This reflects the ordinary human state in which our faculties are not integrated but fight with each other, competing for their rule over our attention. To resolve this dispute they decided that each would leave the body and see whose absence was most missed.
First speech left the body but the body continued though mute. Next the eye left but the body continued though blind. Next the ear left but the body continued though deaf. Mind left but the body continued though unconscious. Finally the Prana began to leave and the body began to die and all the other faculties began to lose their energy. So all they all rushed to Prana and told it to stay, lauding its supremacy. Clearly Prana won the argument. Prana gives energy to all our faculties, without which they cannot function. Without honoring Prana first there is nothing else we can do and no energy with which to do anything. The moral of this story is that to control our faculties the key is the control of Prana.