What do you mean when you say, "Our Father, in heaven"

2nd in series on concise explanations of the Lord's Prayer, line by line.... you can search for the 1st one on this site...

OUR FATHER WHO ART IN HEAVEN: The balance is found not in toning down either God's transcendence or immanence or by taking a middle path between this world (the here and now) and heaven (the eternal), but by understanding what our Lord is teaching us as we address God in prayer: "Our Father[immanence] who art in Heaven[transcendence]." Even in this brief prayer our Lord gave us, we have the proper balance between transcendence and immanence. God is completely above and beyond us (transcendent), but we are instructed to call him "our Father." Isn't this a contradiction? Not at all. For in Christ, the Father reconciles us to himself and adopts us as his own children, co-heirs with Christ. --Mike Horton