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"But the Kingdom of God also defines the Church in its relation to the world. The Church has a foundation of its own, has its own rules, its own mode of existence. But precisely because of the fact that it is the Church of the Kingdom, it has also a positive relation with the world, for the Kingdom of God is seeking acceptance in the world. 

A sower went forth to sow. And the field is the world. That is why the Church is seeking catholicity. And this catholicity has a double aspect, one of extension and one of intensity, in accordance with the nature of the Kingdom. So the Church is a wide as the world. The horizons of the world are also the horizons of the Church; therefore its urge to carry on missionary work, to emigrate, to cross frontiers. This is because the Church is the Church of the Kingdom. She is not allowed to be self-contained. 

But there is also an intensive catholicity of the Church because of the Kingdom. The Church is related to life as a whole. It is not a drop of oil on troubled waters. It has a mission in this world and in the entire structure of the world. This statement does not arise from cultural optimism. This is the confession of the kingship of Christ. For this reason, too, the Church is the Church of the Kingdom. 

And the third remark is my concluding one: as Church of the Kingdom, the Church is seeking the future. She has received her talents for the present. But her Lord who went into a far country will return. Her waiting for Him consists of working. Otherwise she will hear: "What have you done with my talent?"

"When the Time Had Fully Come: Studies in New Testament Theology"

-Herman Ridderbis