Brotherhood constitutes a fact of relationship between every personality in universal existence.  The ultimate goal of human progress is the reverent recognition of the fatherhood of God and the loving materialization of the brotherhood of man. 
While religion is exclusively a personal spiritual experience—knowing God as a Father—the corollary of this experience—knowing man as a brother—entails the adjustment of the self to other selves, and that involves the social or group aspect of religious life.  No person can escape the benefits or the penalties that may come as a result of relationship to other persons. 
Religious revelation is essential to the realization of brotherhood on Urantia.  The quickest way to realize the brotherhood of man on Urantia is to effect the spiritual transformation of present-day humanity.  Impulse of social service is basis of brotherhood of man. 
If each mortal could only become a focus of dynamic affection, this benign virus of love would soon pervade the sentimental emotion-stream of humanity to such an extent that all civilization would be encompassed by love, and that would be the realization of the brotherhood of man.