Lying is intentionally deceiving others. Bearing false witness is one form of lying. The Lord gave this commandment to the children of Israel: “Thou shalt not bear false witness against thy neighbour” (Exodus 20:16). Jesus also taught this when He was on earth (see Matthew 19:18). There are many other forms of lying. When we speak untruths, we are guilty of lying. We can also intentionally deceive others by a gesture or a look, by silence, or by telling only part of the truth. Whenever we lead people in any way to believe something that is not true, we are not being honest.
https://www.lds.org/manual/gospel-princ … y?lang=eng
“A reliable way to make people believe in falsehoods is frequent repetition, because familiarity is not easily distinguished from truth. Authoritarian institutions and marketers have always known this fact.”
― Daniel Kahneman, Nobel Prize Winner, ‘Thinking, Fast and Slow’