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Key Concepts of Mishlei 10-10 (Deception)
In contrast to the man of integrity, the deceptive person feels unfulfilled if he is not taking personal advantage over every situation through one scheme or another. To gain advantage he looks for an angle in the form some useful bit of information that will benefit only those who are in on his scheme. The fewer people who are aware of it, the better his advantage will be, for the ones who are not in on the secret will pay the price.
The devious person cannot avoid giving himself away by signaling his sense of superiority in his body language. When he thinks nobody is looking he expresses his true attitude in his body language, such as in sly winks and facial expressions.
Mishlei tells us that the devious person will ultimately be found out because his body language will give him away. Thus, he will be bring grief upon himself. And if he is less shrewd he will give himself away with the smirk of his lips. Such a man of foolish lips will weary himself trying to convince his victims that he bears no malice.
Exploring Mishlei
(י) קֹרֵץ עַיִן יִתֵּן עַצָּבֶת וֶאֱוִיל שְׂפָתַיִם יִלָּבֵט:
(10) He who winks his eye [in the course of deceiving others], brings grief [upon himself], and the fool who signals with his lips will become weary [trying to convince his victim that he carried no malice.].
In this proverb Mishlei contrasts the instinctive behavior of a devious person who happens to be shrewd with one who is a fool. They both signal their sense of superiority with their body language, but the one who is shrewd limits his indications to the wink of his eye. The fool is less aware of how others are reading him, and unknowingly signals his thoughts with the expression of his lips.
We have previously seen a reference to the power of body language in Mishlei Segment 06-03, where the unprincipled individual is shown to give himself away though his body language. To maintain his standing in the community the unprincipled individual pretends to accept moral teachings and thoughtful criticism. But all the while he reveals his disrespect in subtle ways. When he thinks nobody is looking he expresses his true attitude in his body language, such as sly winks and facial expressions.
Learning Mishlei
(י) קֹרֵץ עַיִן יִתֵּן עַצָּבֶת 
וֶאֱוִיל שְׂפָתַיִם יִלָּבֵט:
A deceptive person who winks his eye — קֹרֵץ עַיִן  to show that he has secret knowledge, brings grief upon himself — יִתֵּן עַצָּבֶת , once he realizes that he has been discovered. And the fool who signals with his lips — וֶאֱוִיל שְׂפָתַיִם  will become weary — יִלָּבֵט  trying to convince his victim that he carried no malice.
Additional Insights
(1) A person communicates his feeling of superiority through his body language. When he tries to involve others in illegal schemes he cannot reveal the truth outright, but he shows through his mannerisms that what he is proposing skirts the boundaries of integrity.
(2) The wink of an eye is a sly mannerism because the innocent victim will not detect it and will be unable to protect himself from the harm that is being perpetrated against him.
(3) The devious person will ultimately harm himself because his body language is so subtle that he will not be aware when it is detected by those he intended to harm. He won’t realize that he has incurred therir ill will.
(4)The fool signals his true motives with the expression of his lips. This is comparatively easy to detect. And the intended victims will immediately catch on. The fool will have a hard time convincing the victim that he means nor harm.
The primary sources used for the insights illuminating this segment are listed below.
(1) -רש”י, אבן עזרא
(2) – המאירי
(3) – חנוך לנער
(4) – אבן עזרא, חנוך לנער