The battle of yoga is with the body and with the ego. You must conquer your ego, or small self, so that you can let your soul, your big Self, be victorious.
Healthy plants and trees yield abundant flowers and fruits. Similarly, from a healthy person, smiles and happiness shine forth like the rays of the sun.
First yoga deals with health, strength and conquest of the body. Next, it lifts the veil of difference between the body and the mind. Lastly, it leads the Sadhaka to peace and unalloyed purity.
