Together with all the saints

I've been familiar with this passage for along time and I at one time even wrote a song about it. But, I had missed the importance of one key phrase.

Eph 3:17-19
I pray that you, being rooted and established in love, may have power, together with all the saints, to grasp how wide and long and high and deep is the love of Christ, and to know this love that surpasses knowledge—that you may be filled to the measure of all the fullness of God.

I guess I had thought "together with all the saints" meant "together as the global body of Christ, with all its races and ethnicities in congregations all over the world." That's fine for all over the world, but what about the people of different ethnicities just down the street?

I've come to believe that we can "grasp how wide and long and high and deep is the love of Christ" better when we are actually sitting in a room "together with all the saints".