32 As the Council's Declaration on Religious Freedom affirms: "Truth is to be sought after in a manner proper to the dignity of the human person and his social nature. The inquiry is to be free, carried on with the aid of teaching or instruction, communication, and dialogue. In the course of these, people explain to one another the truth they have discovered, or think they have discovered, in order thus to assist one another in the quest for truth. Moreover, as the truth is discovered, it is by a personal assent that individuals are to adhere to it". Ecumenical dialogue is of essential importance. "Through such dialogue everyone gains a truer knowledge and more just appreciation of the teaching and religious life of both Communions. In addition, these Communions cooperate more closely in whatever projects a Christian conscience demands for the common good. They also come together for common prayer, where that is permitted. Finally, all are led to examine their own faithfulness to Christ's will for the Church and, wherever necessary, undertake with vigour the tasks of renewal and reform".
Source: Ut Unum Sint (Vatican.va)