280 At the same time, we ask God to strengthen unity within the Church, a unity enriched by differences reconciled by the working of the Spirit. For “in the one Spirit we were all baptized into one body” ( 1 Cor 12:13), in which each member has his or her distinctive contribution to make. As Saint Augustine said, “the ear sees through the eye, and the eye hears through the ear”. It is also urgent to continue to bear witness to the journey of encounter between the different Christian confessions. We cannot forget Christ’s desire “that they may all be one” (cf. Jn 17:21). Hearing his call, we recognize with sorrow that the process of globalization still lacks the prophetic and spiritual contribution of unity among Christians. This notwithstanding, “even as we make this journey towards full communion, we already have the duty to offer common witness to the love of God for all people by working together in the service of humanity”.
Source: Fratelli Tutti (Vatican.va)