=Illustration in Casuistry.=--Suppose, for example, we take the Ten Commandments as a starting-point. They are only ten, and naturally confine themselves to general ideas, and ideas stated mainly in negative form. Moreover, the same act may be brought under more than one rule. In order to resolve the practical perplexities and uncertainties which inevitably arise under such circumstances, _Casuistry_ is built up (from the Latin _casus_, case). The attempt is made to foresee all the different cases of action which may conceivably occur, and provide in advance the exact rule for each case. For example, with reference to the rule "do not kill," a list will be made of all the different situations in which killing might occur:--accident, war, fulfillment of command of political superior (as by a hangman), self-defense (defense of one's own life, of others, of property), deliberate or premeditated killing with its different motives (jealousy, avarice, revenge, etc.), killing with slight premeditation, from sudden impulse, from different sorts and degrees of provocation. To each one of these possible cases is assigned its exact moral quality, its exact degree of turpitude and innocency. Nor can this process end with overt acts; all the inner springs of action which affect regard for life must be similarly classified: envy, animosity, sudden rage, sullenness, cherishing of sense of injury, love of tyrannical power, hardness or hostility, callousness--all these must be specified into their different kinds and the exact moral worth of each determined. What is done for this one kind of case must be done for every part and phase of the entire moral life until it is all inventoried, catalogued, and distributed into pigeon-holes definitely labelled. =Dangers of Casuistry.=--Now dangers and evils attend this way of conceiving the moral life, (a) _It tends to magnify the letter of morality at the expense of its spirit._ It fixes attention not upon the positive good in an act, not upon the underlying agent's disposition which forms its spirit, nor upon the unique occasion and context which form its atmosphere, but upon its literal conformity with Rule A, Class I., Species 1, sub-head (1), etc. The effect of this is inevitably to narrow the scope and lessen the depth of conduct. (i.) It tempts some to hunt for that classification of their act which will make it the most convenient or profitable for themselves. In popular speech, "casuistical" has come to mean a way of judging acts which splits hairs in the effort to find a way of acting that conduces to personal interest and profit, and which yet may be justified by some moral principle. (ii.) With others, this regard for the letter makes conduct formal and pedantic. It gives rise to a rigid and hard type of character illustrated among the Pharisees of olden and the Puritans of modern time--the moral schemes of both classes being strongly impregnated with the notion of fixed moral rules.