In this quote from Gillian Flynn's work, the character Amy is described as exploiting the tendency of sociopaths to believe bigger lies. This highlights the manipulative and cunning nature of the character, showing how they are able to twist the truth to their advantage. It also serves as a commentary on the psychology of those who are willing to deceive others for their own gain. The quote sheds light on the power of deception and the ways in which individuals can manipulate the truth to suit their own needs.