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Roman Catechism
“Against Thy Neighbour”

In order that the faithful may have a clear comprehension of this Commandment it should be explained who is our neighbour, against whom it is unlawful to bear false witness. According to the interpretation of Christ the Lord, our neighbour is he who needs our assistance, whether bound to us by ties of kindred or not, whether a fellow-citizen or a stranger, a friend or an enemy.' It is wrong to think that one may give false evidence against an enemy, since by the command of God and of our Lord we are bound to love him.

Moreover, as every man is bound to love himself, and is thus, in some sense, his own neighbour, it is unlawful for anyone to bear false witness against himself. He who does so brands himself with infamy and disgrace, and injures both himself and the Church of which he is a member, much as the suicide, by his act, does a wrong to the state. This is the doctrine of St. Augustine, who says: To those who do not understand (the precept) properly, it might seem lawful to give false testimony against one’s self, because the words “against thy neighbour” are subjoined in the Commandment. But let no one who bears false testimony against himself think that he has not violated this Commandment, for the standard of loving our neighbour is the love which we cherish towards ourselves.