Wherefore thou art no more a servant, but a son; and if a son, then an heir of God through Christ.
Note 10 at Ga 4:7: What would your reaction be if you were told you were an heir to the richest person in the world, or the most powerful or the most popular? Whatever that reaction would be, it would be positive. You would have hope, joy, peace, and many other reactions.
Being an heir of God is infinitely greater than being an heir to the greatest person alive today. If we aren't experiencing positive emotions in knowing we're heirs of God, it is because we aren't fully understanding or appreciating our inheritance, not because the inheritance is unworthy.
It would have been wonderful if God had just redeemed us from His wrath so that we would not have to spend eternity in hell, but He did much, much more than that. He actually made us His sons and granted us an inheritance. That's supernatural! Only God could embrace a rebellious world and elevate them to son-ship (1Jo 3:1-2).