encouraged to take part in the psalms, responses, hymns and common actions of the Church in which they are guests. If invited by their hosts, they may read a lesson or preach. 119. Regarding assistance at liturgical worship of this type, there should be a meticulous regard for the sensibilities of the clergy and people of all the Christian Communities concerned, as well as for local customs which may vary according to time, place, persons and circumstances. In a Catholic liturgical celebration, ministers