Hashem shook us to our very foundation by destroying the Beis Hamikdash and forcing us to limp away into galus, but at the same time He guaranteed that we retain the ability to return. Failure itself is the incentive to rise and continue. It is challenges and struggles that give a person the chance to turn his life around. Every negative thing in life can be used in a positive way. Rabbi Dessler points out that the word, evil, inverted is, awaken.
Evil is there for the purpose of awakening a person.
Setbacks and obstacles in a person's life are not there to immobilize him, but to offer a challenge, something to fight against in order to strengthen himself and earn his ultimate reward. Since Yaakov can now distinguish between the peripheral and the essential, he is no longer Yaakov but Yisrael. The name Yisrael signifies his worthiness to receive the blessing. The name Yisrael represents struggle with man and angel. Because he struggled he came face to face with Hashem.