The world of Great Expectations revolves around the appearance of things: the appearance of happiness, the appearance of love, the appearance of beauty, the appearance of wealth, and the appearance of criminality. Society enforces strict boundaries between classes, lifestyles, and regions, making it nearly impossible for people to move between these designations, and, thus, forcing people to deceive society in order to gain mobility. Lies and deceit are the weapons used to attain dreams and to make an inflexible world, flexible.
Jaggers is the only honest character in Great Expectations.
By deceiving himself, Pip brings about his own ruin.