Fellowship of the King

From Liam Goligher's Fellowship of the King:

To have fellowship with God means Christians are partners with him. The word "partner" is another root meaning of koinonia. What does it mean to be a partner with God? Christians are caught up into God's great purposes and plans for this world and, to the Christian's great delight and surprise, God's interests have become the Christian's interests. God the Father's great enterprise is to send his Son into the world to bring men and women into a personal relationship with himself and to glorify his Son with the glory he had before the world began. But Christians are more than a part of the plan of God the Father, in the sense of a pawn being moved around a checker board.
As partners in God's great enterprise, Christians begin to feel as God feels about things and see as he sees them. Christians do not just see things from a political or economic point of view. They have a completely different view of the world. That is why Christians feel that the good news message, the Gospel, is their good news message, and that it is their pleasure and duty to participate with God in a great endeavor to proclaim it to all humanity. And if God grieves and mourns over all kinds of injustice and evil, and all the sad consequences of sin, then the Christian, as God's partner, will likewise grieve and mourn over them.