In the Torah we read, “Keep yourselves away from a false matter” (Exod. 23:7). In this connection note that the Hebrew word for falsehood (or lie) is sheker (שֶׁקֶר), which can be rearranged to spell kesher (קֶשֶׁר), meaning a band, gang, or group of people… The power of the lie is often found in the “group” rather than in the individual, and if enough people in a group repeat something untrue, eventually the individual’s conscience will be overruled and the truth will be lost… This is a common methodology regularly employed by mass media for purposes of political propaganda.
Regarding this commandment Abraham Twerski comments that it means we should act in a way that will not move us to “hide,” and that includes hiding within the anonymity of the crowd. “Think about what you are about to do. Is there a possibility that you may at some time have to deny that you did it? If so, then do not do it” (Twerski on Chumash).
Each of us must individually strive to be yashar (יָשָׁר) – upright and honest, and free from the complications and devious speech that attends to lies. We are to be “simple” (תָּמִים) with the LORD our God (Deut. 18:13), which requires that we are first willing to be rigorously honest with ourselves. A favorite quote of mine: “No person is saved except by grace; but there is one sin that makes grace impossible, and that is dishonesty; and there is one thing God must forever and unconditionally require, and that is honesty” (Kierkegaard).
Deut. 18:3 Hebrew reading lesson (click):

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In this special “High Holiday” audio presentation, I discuss the holiday of 
In this world of constant flux, change, and invariable dissolution, is it realistic to expect perfection? Are not our expectations often romanticized notions of how we think things ought be rather than what they really are? Don’t they often collide with the messy and unpredictable matters of life? The desire for elusive “perfection” leads to disillusionment and sorrow. Instead of gratefully accepting what we have, we ask “what if” or wonder about other possibilities that might bring us closer to our supposititious ideal.
“Hear, O heavens, and give ear, O earth: for the LORD hath spoken, I have nourished and brought up children, and they have rebelled against me…. Ah, sinful nation, a people laden with iniquity, offspring of evildoers, children who deal corruptly! They have forsaken the LORD, they have despised the Holy One of Israel, they are utterly estranged. Why will you still be struck down? Why will you continue to rebel? The whole head is sick, and the whole heart faint. From the sole of the foot even to the head, there is no soundness in it, but bruises and sores and raw wounds… Your country lies desolate; your cities are burned with fire; in your very presence foreigners devour your land; it is desolate, as overthrown by foreigners….” (Isa. 1:2-7).
It is written in our Scriptures: “My child, if you receive my words and treasure up my commandments with you, making your ear attentive to wisdom and inclining your heart to understanding; yes, if you cry out for insight and raise your voice for understanding, if you seek it like silver and search for it as for hidden treasures, then you will understand the fear of the LORD (יראת יהוה) and find the knowledge of God (דעת אלהים). For the LORD gives wisdom; from his mouth come knowledge and understanding; he stores up sound wisdom for the upright; he is a shield to those who walk wholeheartedly before Him” (Prov. 2:1-7).
Think counterculturally. Do not let your mind be conformed (lit., “squeezed into the mold”) of this world, but be transformed (μεταμορφόω, i.e., metamorphosized like a caterpillar is changed into a butterfly) by the renewal of your mind (Rom. 12:2). The Greek word translated “renewal” is ἀνακαίνωσις, from ἀνά, meaning “up, into the midst,” and καινός, meaning “newness.” The idea here is that we are inwardly transfigured as we take hold of the truth of the new covenant and make it central to our lives. For this we must “put on the mind of Messiah” and repudiate the world’s values and vain philosophies (1 Cor. 2:16). “When the devil is called the god of this world, it is not because he made it, but because people serve him with worldliness.” The “god of this world” blinds the eyes of those who do not believe so they cannot see the truth of the gospel of Messiah (2 Cor. 4:4). The philosophy of this world is always based on lies, propaganda, fear, lust, pride, anger, appeals to vanity, and so on. We must use discernment and test the world’s assumptions against the truth of the Scriptures.