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Roman Catechism
Second Condition: Judgment
The second condition of an oath is judgment. An oath is not to be taken rashly and inconsiderately, but after deliberation and reflection. When about to take an oath, therefore, one should first consider whether he is obliged to take it, and should weigh well the whole case, reflecting whether it seems to call for an oath. Many other circumstances of time, place, etc., are also to be taken into consideration; and one should not be influenced by love or hatred, or any other passion, but by the nature and necessity of the case. Unless this careful consideration and reflection precede, an oath must be rash and hasty; and of this character are the irreligious affirmations of those, who, on the most unimportant and trifling occasions, swear without thought or reason from the influence of bad habit alone. This we see practiced daily everywhere among buyers and sellers. The latter, to sell at the highest price, the former to purchase at the cheapest rate, make no scruple to strengthen with an oath their praise or dispraise of the goods on sale.
Since, therefore, judgment and prudence are necessary, and since children are not able, on account of their tender years, to understand and judge accurately, Pope St. Cornelius decreed that an oath should not be administered to children before puberty, that is, before their fourteenth year.