Ideally, friendships lead us into deeper communion with each other; those we love mirror the divine reality and so draw us closer to the One they reflect. In our humanness, however, we can forget that the friend is only a reflection of God and instead invest ultimate meaning in the relationship.
If I say, "Let only darkness cover me,
And the light about me be night,"
Even the darkness is not dark to You,
The night dazzles as with the sun;
The darkness is a light to You.