Public prayer in worship brings all the members of the body togehter in agreement. In Matthew 18:19 Jesus says, "Again I say to you, if two of you agree on earth about anything they ask, it will be done for them by my Father in heaven." So when, two or three or more agree in prayer, as in public worship, their prayers have a special power.

I think that the above is the actual context of Matthew 18:20. Didnt really know that before until it was mentioned at campus camp and in the book im reading.

As he is Lord, he has appointed us to be servant lords, to have dominion over the world under him. And we, too, are to control the earth, to develop an authoritative understanding of it, and to spread our presence throughout the world. Antoher way of looking at that is to say that we are to be kings, prophets, and priests under God. So, conveying God's authority; and ethical, reflecting God's presence in holiness, goodness and righteousness.

Hmm, maybe thats what it means when the gospel tract said we are rulers under Him?