This week, as you know, is a period of time for prayer (and fasting, I hope) for the intention of Christian Unity. The intention in my mind, and I might say, in the mind of the Pope, is a non-negotiable: we need not only to pray but to actively work for unity among Christians. This week, therefore, is an invitation to beg the Lord for the grace of unity for the Church.
Pope Benedict speaks to the matter of our own conversion, a deep change of heart viz. unity. We need a united witness to the Gospel of Jesus Christ today.