It is obvious that this dialogue can develop only in a context of sincere and committed spirituality. We cannot "bring about" unity by our powers alone. We can only obtain unity as a gift of the Holy Spirit. Consequently, spiritual ecumenism - prayer, conversion and the sanctification of life - constitutes the heart of the meeting and of the ecumenical movement (cf. Unitatis Redintegratio, n. 8; Ut Unum Sint, 15ff., 21, etc.). It could be said that the best form of ecumenism consists in living in accordance with the Gospel.