Fullness In Fellowship

Unity in Diversity the cliché so devoid of meaning that it fails to say what is so central to the Gospel of Our Lord. A unity in fact a fellowship uninterrupted! Sounds like heaven and the vision of John who saw them inummerable from every tribe before the throne and before the Lamb. So if conflict is a result of our difference how do we find fullness and fellowship with those who are so different from us?