Moral Theology / A Complete Course Based on St. Thomas Aquinas and the Best Modern Authorities

by John A. McHugh; Charles J. Callan

(a) All must know, from the necessity of the case (necessity of means), that they have a supernatural destiny and that Christ is the Way that leads to it; for one cannot tend to a destination, if one is unaware of its existence and of the road that will bring one there. Hence, all must know the four basic truths: God our Last End, the Trinity, the Incarnation, God the Remunerator (see 787).

(b) All must know, from the will of Christ (necessity of precept), the other truths to which He wishes them expressly to assent, and the duties, general or particular, that He wishes them to fulfill (Mark, xvi. 16); that is, they must know the doctrine contained in the Creed, the commandments and ordinances of Christ concerning the Sacraments and prayer, and the special obligations of each one’s particular state or office.

919. As to the degree of knowledge that one must possess intensively (i.e., as to its quality and perfection), it is clear that knowledge ought to be more perfect in those who are more intelligent or whose duties call for a more excellent learning.

(a) Knowledge of the truths that should be known by all the faithful ought to be of a more developed kind in those whose minds are more mature. A scientific and theological understanding of religion is not required in any lay person; nor should we expect the same knowledge in a child as in an adult, or in a subnormal person as in one who is normal mentally. Examples: No religious instruction is necessary for an idiot (i.e., a grown-up person who has the mind of a two-year-old child), for such a one cannot reason. A child of seven or an imbecile (i.e., a grown-up person whose mentality is on a par with that of a child of seven) may be received to Communion, after such a child or imbecile has learned in a simple way that the God-Man is received in the Eucharist and that it is not common food. A child who is between ten and twelve and a moron (i.e., a grown-up who is not mentally such a child’s superior) should receive more instruction than an imbecile.

(b) Knowledge of sacred doctrine naturally should be greater in priests than in the laity; for in religious things priests are the teachers, the people their pupils (Mal., ii. 7). A mediocre knowledge of theology in a priest is not sufficient, especially in these days when the laity are educated, when theological questions are debated on all sides, and when so many outside the Church as well as in it are looking for help and light. A profound knowledge of abstruse questions, however, is not demanded of all priests in an equal degree: more is expected of a bishop than of his parish priests, more of a parish priest than of one who has not the care of souls or office of teaching, more of one who has to speak to or write for the better educated than of one who has to do these things for those who are less educated, etc. Knowledge should include not only learning, but also prudence (i.e., good judgment and practical ability to use learning well), for a priest learns, not for his own sake alone, but also for the benefit of others.

920. Scientific or complete knowledge is not required of those who are not theologians, as was said about the four basic truths (see 790). It suffices for lay persons that they know in a simple way, according to their age and capacity, the substance of the truths they must believe. Thus, they should know:

(a) The Creed.—One should know about God, that He is but one and that there are three divine Persons, Father, Son and Holy Ghost; that God is the maker of the world, and that He will reward everyone according to his deeds. One should know about Christ, that He is the Son of God and God Himself; that He was miraculously born of the Blessed Virgin Mary; that He suffered and died for our salvation; that He rose from the dead and by His own power ascended into glory and will come again after the general resurrection to judge all. One should know about the Church, that it is the one true Church founded by Christ, in which are found the communication of spiritual goods and the forgiveness of sins.

(b) The Decalogue.—One should know the general meaning of the Commandments so as to be able to regulate one’s own conduct by them. It is not necessary that a child should know all the kinds of crimes and vices that are forbidden by the Commandments. In fact, it is better for such not to know much about evil. Nor is it required that a layman should know how to make correct applications of the Commandments to complicated situations that require much previous study.

(c) The Virtues.—One should know enough to be able to apply to one’s own life, for ordinary cases, what a virtuous life demands. It is not necessary that a child should know the requirements of prudence as well as an experienced person, or that a layman should be able to settle doubts of conscience as well as a priest. But each should know enough to fulfill what is required of one of his age and condition. Both old and young should know in substance the acts of faith, hope, charity and contrition; for to these all are bound. The young should know the laws of the Church that apply to them (e.g., the law of abstinence); the older people should understand the law of fasting which they are bound to observe, etc.

(d) The Sacraments.—One should know substantially the doctrine of the Sacraments that are necessary for all, namely, Baptism, Penance and the Eucharist. Since all the faithful have the duty of baptizing in case of necessity, all should know how to administer lay Baptism properly and fruitfully. When the time comes for receiving a Sacrament, the recipient should know enough to receive it validly, licitly, and devoutly, although less knowledge is required in children and in the dying who cannot be fully instructed (see Canons 752, 854, 1330, 1331, 1020).