That they all may be one is a phrase derived from a verse in the Bible at John 17:21, which says:
- That they all may be one; as thou, Father, art in me, and I in thee, that they also may be one in us: that the world may believe that thou hast sent me".
The phrase forms the basis of several ecumenical movements and united and uniting denominational traditions. It is also a common sermon topic on church unity.
The phrase is the official motto of the Church of South India . The Latin version, Ut Omnes Unum Sint, is the motto of the World Student Christian Federation and the YMCA. The United Church of Christ has the same motto except for a change in the place of one word: "That they may all be one."
Pope John Paul II published an encyclical under the Vulgate form this title, Ut Unum Sint.
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