don't know " i.e., I have no knowledge which I can communicate.
Although strict mental reservations are lies, and therefore sinful, yet wide mental reservations are in common use; they are necessary, and they are not lies. They are necessary because justice and charity require that secrets should be kept, and frequently there is no other way of keeping them. They are not lies because, as we saw above, words take their meaning not only from their grammatical signification, but from the circumstances in which they are used. When a priest is asked about a sin which a penitent has confessed to him, and he answers, " I never heard of it," he speaks as a man, not as a confessor who holds the place of God in the tribunal of Penance. All are aware that he is a priest, and to all his words mean, " I never heard of it outside of the confessional." He never speaks of what he has heard inside the confessional, and nothing can, or should, be gathered about what he has heard there from the words which he uses. Although these wide mental reservations are not lies, yet they must not be employed without just cause, for the good of society requires that we should speak our mind with frankness and sincerity in the sense in which we are understood by our hearers, unless there be a good reason for permitting their self-deception when they take our words in a sense that we do not mean.
Truth requires not only that we should say nothing that we know to be false, but also that we should weigh our statements and not make rash and unconsidered assertions. There are some people whose talk runs babbling along like a stream in a fresh, and with as little meaning. A man with a love for truth will be more sparing of his words, and will weigh them before giving them currency.
