Psychopaths know how to act to get what they want, but they never feel the emotion they copy.

How can you know that you’re with a psychopath when they use words convincingly underscored by observed emotion? Psychopaths know how to act to get what they want, but they never feel the emotion they copy. Despite the psychopath's lack of conscience and lack of empathy for others, they are inevitably better at fooling people than any other type of offender. ― Anna Salter