2658. Accidental Changes or Separations as to Matter and Form.—(a) These administrations are not invalid, for they preserve the essence of the elements or the sense of the words appointed by Christ. Examples of accidental change of matter are baptismal water to which a relatively very small quantity of wine has been added, or wine for the Eucharist to which a relatively trifling amount of water has been added. The form is accidentally modified if translated into the vernacular or rendered by synonymous words (e.g., “Ego abluo te, etc.”), or if an unimportant word (e.g., “enim”) is added or subtracted, or if the words are transposed or partially repeated or unintentionally mispronounced without detriment to sense (e.g., “Hoc est meum corpus,” “Hoc, hoc, est, est, etc.,” “Hoc est copus meum”). There is accidental separation when slight pauses are made between words, or when an interval not destructive of the sense falls between the use of the matter and the use of the form (see 2655, 2656).
(b) These administrations are unlawful and from their nature mortally sinful, since they are transgressions of a precept of the Church meant to safeguard respect for the Sacraments of Christ, and they are therefore opposed to the virtue of religion (2147). But the sin may be venial by reason of lightness of matter (e.g., omission of the word “enim”), or of imperfection of the act. Scandal, danger of invalidity, contempt, and bad intention would make even a small change a serious sin. In practice the rule to follow is to observe exactly the prescribed matter and form and entire rite, to pronounce the words clearly and slowly, to repeat the form when any involuntary interruption happens between its essential parts, and to unite the matter and form as closely as possible.
2659. Substantial Changes or Separations.—Substantial changes or separations _a fortiori_ are grave sins. They offend against religion (since they make a mockery of the sacred signs appointed by Christ), against obedience (since they disregard a most serious precept of the Church), against charity (since they deprive the recipient of sacramental grace), and against justice (at least when the minister is bound _ex officio_ to confer the Sacrament, since there is then a quasi-contract with the recipient to administer the Sacrament correctly).
2660. Doubtful Matter.—It is sometimes probable but not certain that an element suffices for the matter of a Sacrament (e.g., coffee or tea for Baptism, chrism for Extreme Unction). Hence the question: “Is it lawful to use probable matter in the administration of a Sacrament?”
(a) If certain matter cannot be had and the Sacrament is urgently necessary or very useful, probable matter may be used. For the Sacraments were instituted by Christ to benefit man (“The Sacraments are for men”), and hence it is not irreverent to give to one in need a probably valid Sacrament when a certainly valid Sacrament is impossible. Thus, a dying infant may and should be baptized with coffee, if no pure water can be procured in time; the last anointing may be conferred with chrism, if the oil of the sick cannot be had before a dying man will have expired.
(b) If certain matter can be had, or if the Sacrament is not urgently necessary or useful, probable matter may not be used without grave sin; for there is then no reason of necessity to justify the risk to which the Sacrament and perhaps also the recipient are exposed, Thus, it is not lawful to baptize with coffee when pure water can be secured, or to confirm with chrism not blessed by a bishop a dying man who had just received the last Sacraments, even though other chrism is unobtainable (see 661, 678, 711, and Denziger, n. 1151).
2661. What Sacraments Have a Necessity of Means (see 360, 786, 2156)?—(a) Those Sacraments have a necessity of means without which sanctifying grace and salvation cannot be had. Hence the necessity for individuals of Baptism (without which there is no regeneration), of Penance (without which there is no reconciliation), of the Eucharist’s effect (without which there is no incorporation with Christ), and for the Church the necessity of Orders (without which there are no ministers and dispensers of grace, Prov., xi, 14).
(b) Those Sacraments have no necessity of means without which sanctifying grace and salvation can be had; but they have a necessity of convenience, inasmuch as they perfect grace already had and make salvation more easy. In this sense, then, Confirmation and Extreme Unction may be called necessary for the individual, since the former perfects the grace of Baptism and the latter the grace of Penance; and Matrimony may be called necessary for the Church, since it perfects with a sacramental grace the propagation of the children of the Church.
2662. Reception of Sacraments _in re_ or _in voto_.—The Sacraments that have a necessity of means must be received either in themselves (_in re_) or in desire (_in voto_).
(a) Thus, Baptism _in re_ is necessary for all infants (John, iii. 5), Baptism _in re_ or _in voto_ for all adults (John, xiv. 21-23). Baptism of desire consists in an act of perfect charity or contrition made by an unbaptized person, which includes the will to do all that God has commanded, and consequently at least an implicit or virtual desire of Baptism of water. As is proved in Dogmatic Theology, Baptism may be supplied for, as regards grace, by martyrdom in an infant and by martyrdom joined with attrition in an adult.