We know that Jesus cares about Church unity and that He would like us to be "one flock" John 10:16 I have other sheep that are not of this sheep pen. I must bring them also. They too will listen to my voice, and there shall be one flock and one shepherd. But we failed Him on this one, the East and the West. We failed, in 1054, him for political reasons and not about the "truth". In any event, we can have full communion without having to agree on all doctrinal issues. To this day I do not understand why a well meaning Catholic that wants to take communion in an Orthodox Church is not allowed to do so. After all, Catholics and Orthodox do have the same understanding about the real presence of Christ in the Eucharist, and Orthodox are allowed to participate in the Sacraments of the Catholic Church, including the Eucharist and Confession.