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Roman Catechism
This Commandment Forbids Lies Of All Kinds

In a word, lies of every sort are prohibited, especially those that cause grave injury to anyone, while most impious of all is a lie uttered against or regarding religion.

God is also grievously offended by those attacks and slanders which are termed lampoons, and other defamatory publications of this kind.

To deceive by a jocose or officious lie, even though it helps or harms no one, is, notwithstanding, altogether unworthy; for thus the Apostle admonishes us: Putting away lying, speak ye the truth. This practice begets a strong tendency to frequent and serious lying, and from jocose lying men contract the habit of lying, lose all reputation for truth, and ultimately find it necessary, in order to gain belief, to have recourse to continual swearing.