The People of God is formed into one in the first place by the Word of the living God.... the preaching of the Word is required for the sacramental ministry itself, since the sacraments are sacraments of faith, drawing their origin and nourishment from the Word. 43
Catechism number 1126
Likewise, since the sacraments express and develop the communion of faith in the Church, the lex orandi is one of the essential criteria of the dialogue that seeks to restore the unity of Christians.47