Lying big always starts from simple steps, aka lying small. First, as kids, we learn to tell pro-social lies, like telling your grandma you like that new hand-knit sweater she gave you on Christmas when, in fact, you can’t even look at it.
According to this study from the journal Nature Neuroscience, “when people tell small lies, the brain becomes desensitized to the pang of guilt that dishonesty usually causes.”
The more little pro-lies we give, the less guilt we feel, and the more it snowballs into bigger lies that suddenly become way easier. In some cases, people get so used to falsifying or fabricating things that they start believing their lies. At some point, it turns into habit and it becomes incredibly hard to quit for good.