Charles Hodge on Ephesians 2:19

V. 19. The consequences of this reconciliation are that the Gentiles are now fellow-citizens of the saints, members of the family of God, and part of that temple in which God dwells by his Spirit. Formerly they were ξένοι, strangers, now they are συμπολῖται, fellow-citizens. Formerly the Gentiles stood in the same relation to the theocracy or commonwealth of Israel, that we do to a foreign State. They had no share in its privileges, no participation in its blessings. Now they are "fellow-citizens of the saints." By saints are not to be understood the Jews, nor the ancient patriarchs, but the people of God. Christians have become, under the new dispensation, what the Jews once were, viz. saints, men selected and separated from the world, and consecrated to God as his peculiar people. They now constitute the theocracy—which is no longer confined to any one people or country, but embraces all in every country who have access to God by Christ Jesus. In this spiritual kingdom the Gentiles have now the right of citizenship. They are on terms of perfect equality with all other members of that kingdom. And that kingdom is the kingdom of heaven. The same terms of admission are required, and neither more nor less, for membership in that kingdom, and for admission into heaven; all who enter the one enter the other; the one is but the infancy of the other; we are now, says Paul, the citizens of heaven. It is not, therefore, to the participation of the privileges of the old, external, visible theocracy, nor simply to the pale of the visible Christian church, that the apostle here welcomes his Gentile brethren, but to the spiritual Israel, the communion of saints; to citizenship in that kingdom of which Christ is king, and membership in that body of which he is the head. It is only a change of illustration without any essential change of sense, when the apostle adds, they are no longer πάροικοι but οἰκεῖοι. The family is a much more intimate brotherhood than the State. The relation to a father is much more sacred and tender than that which we bear to a civil ruler; and therefore, there is an advance in this clause beyond what is said in the former. If in the former we are said to be fellow-citizens with the saints, here we are said to be the children of God; whose character and privileges belong to all those in whom God dwells by his Spirit.