"Our Father"
Community here on earth. The same Father who is Father to me is the Father to a believer on the other side of the planet.
"our"...unity.
My blood brother has the same physical father as I do. We (Dave and I) are very different, but our dad is the same dad. He treats us differently, because we are different people...but he is the same.
Right now, I'm angry and frustrated with Dave...but he's still my brother and I love him. Don't like him much, but I love him.
We have the same father.
"Father"
the One who gives us life. Who nurtures us, feeds us. the only one who will be there always.
Everybody else will leave, only God is the constant. Trust no one but God.
"Abba" - Father...a term of intimacy, kinship and surety.
For all who are led by the Spirit of God are children of God. For you did not receive a spirit of slavery to fall back into fear, but you have received a spirit of adoption. When we cry, ‘Abba! Father!’ it is that very Spirit bearing witness with our spirit that we are children of God, and if children, then heirs, heirs of God and joint heirs with Christ—if, in fact, we suffer with him so that we may also be glorified with him. (Romans 8:14-17, NRSV; cf. Gal. 4:5-6)