Lying

Harris makes a short and absolute case against lying, including white lies told to spare feelings. His argument is that deception is a form of coercion because it removes the other person's ability to act on accurate information, and that the liar arrogates to themselves the decision about what another person may know. He distinguishes lying from withholding, arguing that a person is not obliged to disclose everything but is obliged not to state what they believe to be false. This allows a great deal of tact without permitting deception.

His practical argument concerns the accumulating costs. A lie requires maintenance, must be remembered, generates further lies to protect it, and creates a permanent risk of discovery that changes the relationship it was meant to protect. He argues that white lies are the most damaging category because they are constant, because they deprive people of information they need, and because the person telling them learns nothing about how the other person would have handled the truth.

He covers specific cases including lying to children about Santa Claus, praising work you think is poor, and the classic murderer at the door problem, which he treats as a genuine exception under conditions of duress against someone who has forfeited their claim to honest dealing.

The book is very short, essentially an essay. It contains no research and Harris offers no empirical evidence about whether honest people fare better. The position is absolutist and Harris does not seriously engage with the strongest objections. Its value is the clarity of the distinction between lying and withholding, which is directly usable in professional situations where the alternative to a lie is assumed to be cruelty.