So the author's answer to the glaring problem is that though we do not see the reality of what God has promised for the human race, for those that are his sons and daughters. We don't see the reality of it in our own lives. We can look up to the throne and they're seated the majesty on high as the person of Jesus and Jesus Christ is reigning with all things in subjection under his feet. And the reality is then the guarantee for us then is that if that is true for him, it's going to be true for every one of his brothers and sisters for every son and daughter of God.
R1: Main claim or thesis (supported by much of the sermon or primary source)