214. When the acts tending to the same object are external, they are multiplied numerically in moral estimation, and make distinct sins as follows: (a) if the internal acts from which they proceed are numerically distinct sins (e.g., if a burglar attempts to rob a house, but leaves his work unfinished because he becomes conscience-stricken or is interrupted, and later makes another plan and another attempt, there are two sins); (b) if the external acts are of such a kind that no internal intention can make them morally one act, even when one follows directly upon the other (e.g., missing Mass on Sunday and again on the following day, a holyday, makes one guilty of two distinct violations of the law). 215. In the following cases, however, distinct external acts with reference to the same object do not multiply the number of sins: (a) when these acts form a part of one moral whole, and are intended as such by the agent (e.g., one who reads a forbidden book, but divides it into parts, reading only so many pages a day); (b) when these acts have to one another the relation of means to a common end, and they are intended as such by the agent (e.g., various preparations made for robbery). 216. Third Rule of Numerical Distinction.--One sinful act, internal or external, that is concerned with objects that are physically many, but morally one, makes but one sin in number. Example: He who steals a purse that contains ten bills commits one sin; he who calumniates a family of ten persons commits one sin; he who steals what is the common property of three proprietors commits one sin. 217. When the objects are not morally one of themselves, they may become so through the belief of the one who acts, since distinct malices are not incurred except as apprehended (see 588-592). Example: He who tells three different lies against a neighbor (e.g., that he is a thief, a drunkard and a liar), commits one sin of calumny, if he has in mind general injury to reputation, but does not think at the time of the special injuries contained in his calumny. Likewise, he who calumniates before ten persons commits but one sin of calumny, if, being in a passion, he thinks only of the harm he wishes to cause and not of the number of persons who are present. 218. When the objects are morally one, they may become many through the intention of the one who acts. Example: He who calumniates a family of three persons by saying they are all dishonest, commits three sins, if he intends three distinct injuries (e.g., against the business of one, the religious reputation of another, and the friendship of the third). So also he who steals part of the money in a purse, and later on, having another opportunity, decides to steal the rest, commits two sins.