“The smile of a deceiver is flawed, insufficient. But can we see these muscles resting there inert when there’s so much local variation in faces, pads of fat, odd concavities, differences of bone structure? Especially difficult when the first and best unconscious move of a deliberate liar is to persuade himself he’s sincere. And once he’s sincere, all deception vanishes.”

“The smile of a deceiver is flawed, insufficient. But can we see these muscles resting there inert when there’s so much local variation in faces, pads of fat, odd concavities, differences of bone structure? Especially difficult when the first and best unconscious move of a deliberate liar is to persuade himself he’s sincere. And once he’s sincere, all deception vanishes.”

— Ian McEwan