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Roman Catechism
First Condition: Truth
Truth, then, holds the first place in an oath What is asserted must be true and he who swears must believe what he swears to be true, being influenced not by rash judgment or mere conjecture, but by solid reasons. Truth is a condition not less necessary in a promissory than in an affirmatory oath He who promises must be disposed to perform and fulfil his promise at the appointed time As no conscientious man will promise to do what he considers opposed to the most holy Commandments and will of God; so, having promised and sworn to do what is lawful, he will never fail to adhere to his engagement, unless, perhaps by a change of circumstances it should happen that, if he wished to keep faith and observe his promises, he must incur the displeasure and enmity of God That truth is necessary to an oath David also declares in these words: He that sweareth to his neighbour, and deceiveth not.