959. Non-Catholics have not the same right as Catholics to receive the rites of the Church, and hence when they are admitted to them, there are certain restrictions to be observed.
(a) Restrictions as to Sacred Things.—As admission of non-Catholics to sacramentals, etc., is a favor, not a right, it should be confined to cases allowed by the Church. Thus, it is forbidden to grant indulgences or to give the nuptial blessing to non-Catholics, and only in very exceptional cases may any ceremonies be permitted at mixed marriages (Canons 1102, 1109). Non-Catholics may not receive the Pax; may not be invited to take part in the solemn services of receiving ashes on Ash Wednesday, palms on Palm Sunday and candles on Candlemas Day; may not receive ecclesiastical burial (Holy Office, June 8, 1859). Children sent by their parents to non-Catholic services may not be confirmed (Holy Office, August 28, 1780); a Catholic priest is not allowed to supply for a non-Catholic minister, by accompanying the body of a non-Catholic from the home to the graveyard, even though the body be not brought to Church, nor the bell tolled (Holy Office, January 26, 1886). It is not permissible to lend a Catholic church to non-Catholics for their services.
(b) Restrictions as to Persons.—As superstition and irreverence have to be avoided, the sacramentals may not be administered or given at all to non-Catholics about whose good faith and purpose there is doubt.
(c) Restrictions as to Mode.—The Church, while she wishes to help and benefit non-Catholics, must avoid anything that would cause scandal or have the appearance of equal recognition of believers and unbelievers. Thus, when Mass is offered for outsiders, the same publicity and pomp is not permitted as when there is question of Catholics.
960. As regards the performance of Catholic rites by non-Catholics, the Church disapproves of every kind of such participation, but does not refuse to tolerate the more remote kind, when there is grave necessity and no scandal is caused.
(a) By more remote participation we understand such as scarcely differs from passive assistance (e.g., to act as witness at a marriage), or such as carries with it no recognition as an official of the Church (e.g., to act as substitute or temporary organist). Hence, the Church has permitted this kind of participation in particular cases, when the authorities decided that there was urgent necessity and no scandal. Examples: Moralists hold that, when a heretic or schismatic has been designated as sponsor at Baptism and cannot be refused without grave offense, he may be allowed to act as witness. The Holy Office has also declared that heretics should not be used as witnesses at marriage, but may be tolerated as such by the Ordinary, when there is a grave reason and no scandal (August 18, 1891); that a non-Catholic organist may be employed temporarily, if it is impossible to secure one who is a Catholic, and no scandal is caused (February 23, 1820); that in certain special circumstances girls belonging to a schismatical sect might be allowed to sing with the Catholics at church functions, especially at Exposition and Benediction of the Blessed Sacrament (January 25, 1906).
(b) Proximate participation is the exercise of functions connected with a sacred rite (e.g., to act as server at Mass), or that imply a recognition of the religion of the one who participates (e.g., to act as representative of some sect at a funeral and receive liturgical honors). The Church has always refused to tolerate this kind of participation. Examples: Non-Catholics may not act as sponsors at Baptism or Confirmation under pain of invalidity of sponsorship (Canons 765, 795), nor chant the Office in choir (Holy Office, June 8, 1859), nor be employed as singers of the liturgical music (Holy Office, May 1, 1889), nor carry torches or lights in church ceremonies (Holy Office, November 20, 1850). Likewise, non-Catholics may not become members of Catholic confraternities, nor assist at Catholic services as official representatives of some sect or sectarian society.
961. Participation of Catholics in non-Catholic services may happen today in so many ways, and it is so difficult at times to draw the line between lawful and unlawful communication, that it is well before considering these cases to state the general rules that apply here.
(a) It is lawful to perform an act from which two effects follow, one good and the other bad, if the act in itself is good or indifferent, if there is a sufficiently grave reason for performing it, if the evil effect is not intended, and if the evil effect be not prior to the good effect (see 104).
(b) Circumstances vary in different localities and countries, and communication that would signify unity of belief in a place where Catholics and non-Catholics are very unequal numerically might be very harmless in a place where there is no great numerical difference. Offense to non-Catholics should not be given needlessly.