God never promised us we wouldn't go through things in this world. What Jesus said was that we should have no fear because He has overcome the world. Ever taken an open book test? Where the answers are all in the book? Well yeah, for the believer in Jesus Christ, no matter what you go through, you already know we win in the end. Go read the book of Revelation... the back of the book tells you how the story ends! We win in the end!