It is something like air is needed to ignite fire and the same air can put off the fire. When the air is violent then its puts off the burning fire and when the air is submissive one can light the fire. The same holds good for using mind in the realization of the self. As mentioned, mind is like a wild animal. Mind cannot be controlled it can only be tamed.
Yoga is the first basic step in which one can tame the mind.
By taming the body one can tame the mind. The steps of taming the body and finally the mind are the real purpose of yoga. Basically you are instructed to do some regular pattern of movements, which is continuously done over a period of time, tames the mind to obey. Healing occurs when the co-ordination of mind and body is restored. Healing is a process that takes place only when there the mind and the body are aware of each other.