Rules and Discernment
304. It is reductive simply to consider whether or not an individual's actions correspond to a general law or rule, because that is not enough to discern and ensure full fidelity to God in the concrete life of a human being. I earnestly ask that we always recall a teaching of Saint Thomas Aquinas and learn to incorporate it in our pastoral discernment: "Although there is necessity in the general principles, the more we descend to matters of detail, the more frequently we encounter defects... In matters of action, truth or practical rectitude is not the same for all, as to matters of detail, but only as to the general principles; and where there is the same rectitude in matters of detail, it is not equally known to all... The principle will be found to fail, according as we descend further into detail".347 It is true that general rules set forth a good which can never be disregarded or neglected, but in their formulation they cannot provide absolutely for all particular situations. At the same time, it must be said that, precisely for that reason, what is part of a practical discernment in particular circumstances cannot be elevated to the level of a rule. That would not only lead to an intolerable casuistry, but would endanger the very values which must be preserved with special care.348
347 Summa Theologiae, I-II, q. 94, art. 4.
348 In another text, referring to the general knowledge of the rule and the particular knowledge of practical discernment, Saint Thomas states that "if only one of the two is present, it is preferable that it be the knowledge of the particular reality, which is closer to the act": Sententia libri Ethicorum, VI 6 (ed. Leonina, t. XLVII, 354).
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