How important is Christian unity?

Peretty darn important. If you aren't sure, prayerfully read John 17 and weep for the mess that the world has become and persists in because we give scandal instead of a sign. Weep likewise for families that have devolved into an association of individuals merely sharing a name or an address. Yesterday was the feast of St. Josaphat, martyr. He gave his life for his family and for unity, as our Saviour did for us and ours. What is our family worth to us?