In the entire world, there is not one human being who is free from pain. Even in favorable conditions, a person encounters struggle. The external form of struggle appears to be cruel. Some describe it as a horrible demon, but its nature is not malicious. In fact, it is proper to welcome struggle, for its arrival is always auspicious. Struggle keeps us from growing sluggish. It changes an animal into an ideal person. It transforms an ordinary human into a spiritually-awake person respected by the world. . . . It is alright if we cannot receive struggle with love, but struggle should never be discarded. To discard struggle is to discard God's grace.
— Swami Kripalu , The Wisdom of Yoga by Stephen Cope