In comparing the value of truth over falsehood Mishlei looks at the durability of a true statement versus the short life span of a lie. The truth stands on a firm foundation and will not waver no matter how much time has passed. This is a characteristic of the wisdom of the Torah. In contrast, a false statement lives but for a moment. It does not take long for its internal contradictions to be exposed.
יט = שְׂפַת־אֱמֶת תִּכּוֹן לָעַד וְעַד־אַרְגִּיעָה לְשׁוֹן שָׁקֶר
Words from truthful lips will last forever
but words from a false tongue are but for a moment.
The proverb contrasts the lasting value of truth with the short-term existence of falsehoood. Truth is associated with the lips that have uttered it whereas falsehood is associated with the lying tongue. This is because truth stands on its own merits and even a comparatively simple instrument like the lips suffices to gain credibility and acceptance. However, falsehood requires elaborate rhetoric and deception to convince the listener.
(19) Words from truthful lips — שְׂפַת־אֱמֶת
will last forever — תִּכּוֹן לָעַד,
but words spoken by a false tongue — לְשׁוֹן שָׁקֶר –
are but for a moment — וְעַד־אַרְגִּיעָה.
(1) The lips that speak truth will live forever because people will always want to hear that truth and they will continue to repeat it for all time. As for words from a lying tongue, once their falsity has been demonstrated the credibiity of the speaker will have been destroyed and people will no longer pay attention to those words. Then, even the speaker’s valid statements will be disbelieved. (רבינו יונה, מצודות, חנוך לנער)
(2) The words from the lying tongue exists only during the time time that they are being spoken. Shortly thereafter people recognize them as being false. As far as the speaker is concerned, he knows he is lying even as he speaks. (רבינו בחיי, מצודות)
(3) The nature of truth is that it never changes. Therefore, one who speaks the truth can have peace of mind. He doesn’t have to be concerned that he will one day be shown to have lied. (חנוך לנער)
(4) Truth does not require artful language to be believed, because its honesty is self-evident. This is not the case for falsehoods. The tongue, which is a more dexterous instrument than the lips, is associated with falsehood which depends on subterfuge. In contrast the movement of the lips is visible to the eye and is therefore open to all. (חנוך לנער, הגר”א, מלבים)
(5) Falsehood (שֶּׁקֶר) is described by the Gemara (Shabbas 104a) as standing on one leg whereas truth (אֱמֶת) is described as standing on a solid foundation. This is because the letters shin, kuf and reish are insecurely poised, each being written with a pointed bottom. In contrast the letters aleph, mem, and soph are firmly set, resting on two points (aleph and soph) or a horizontal bar (mem). (שבת קד ע”א)
(6) Truth exists throught all time. It testifies about the past and continues to exist in the present and future. Falsehood exists only in the present and therefore may be described as standing on one leg. The world of our present existence is a false world (עוֹלָם הַשֶּׁקֶר) because it exists only in the present. It serves as the beginning to the World to Come which exists for all time and is therefore the world of truth (עוֹלָם הָאֱמֶת). (שבט מיהודה)
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