The Apostle Paul agrees with John that we shall be like Jesus. It is our destiny which God determined before the foundation of the world. And we know that God causes all things to work together for good to those who love God, to those who are called according to His purpose. This is one of the most often quoted verses in the Bible. And well it should be.
Nothing can be more comforting.
That is what He is aiming at in our lives. Not health, or wealth or earthly success but Christlikeness. If you love God and are called according to His purpose, then everything that has come your way and will come your way is designed by God to shape you more into the likeness of Jesus. Good things shape us, hard things shape us, successes shape us, failures shape us. All things work together to shape us into the likeness of Jesus.