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Roman Catechism
Various Ways In Which Cod’s Name Is Dishonoured: False Oaths
Among false swearers are to be numbered not only those who affirm as true what they know to be false, but also those who swear to what is really true, believing it to be false. For since the essence of a lie consists in speaking contrary to one’s belief and conviction, these persons are evidently guilty of a lie, and of perjury. On the same principle, he who swears to that which he thinks to be true, but which is really false, also incurs the guilt of perjury, unless he has used proper care and diligence to arrive at a full knowledge of the matter. Although he swears according to his belief, he nevertheless sins against this Commandment. Again, he who binds himself by oath to the performance of anything, not intending to fulfil his promise, or, having had the intention, neglect its performance, guilty of the same sin. This equally applies to those who, having bound themselves to God by vow, neglect its fulfilment.