God's purpose was that we Jews who were the first to trust in Christ would bring praise and glory to God. And now you Gentiles have also heard the truth, the Good News that God saves you. And when you believed in Christ, he identified you as his own by giving you the Holy Spirit, whom he promised long ago. The Spirit is God's guarantee that he will give us the inheritance he promised and that he has purchased us to be his own people. He did this so we would praise and glorify him.
It is truly a miracle that we are invited into your family. Trusting is Christ is the only real requirement to being reconciled to you. Learning to live in your kingdom is about receiving your authority and accepting your will. Believing in Christ goes far beyond simple intellectual acknowledgement of the truth. It requires that we be aligned with the motivation to know you in the way that Jesus demonstrated while on earth. This enables a rich inheritance that is available to all the citizens of your kingdom.