Jesus identified this mark of His Church: “By this all people will know that you are my disciples, if you have love for one another.” John 13:35

Since Jesus Himself declared it, and since without such love preaching is useless (1 Cor. 13:1), the worship of God is false (1 John 4:20), and people will not recognize us as true followers of Jesus, would we not benefit from considering that mark among the highest?