Robert Greene's third technique in the "managing appearances" trio: behave as though you are destined for great things, and others will treat you accordingly — because your inner sense of security or insecurity is part of the aura they're reading, whether or not you say a word about it.
The distinctive move is that Greene decouples the technique from authentic feeling entirely: "I am destined for something great, even if you don't feel it — if you fake it, it's good enough." Acting like a king or queen works as a performed technique regardless of whether the confidence is sincerely felt, collapsing the usual distinction between genuine self-belief and its imitation. This is stronger than ordinary "fake it till you make it" advice — Greene isn't claiming the feeling becomes real, only that the performance alone is sufficient to produce the effect.
50 Cent is the case study: Greene pairs 50 Cent's harshest origin detail (dealing crack at age 9 in southside Queens) with the claim that he "always felt" destined for greatness regardless — using the self-image itself, not the circumstances that would normally justify it, as the operative cause of the effect.
Part of Power as Managing Appearances (The Aura Game)'s three-technique bundle (with Embrace Silence / Self-Granted Pause and Confident Entrance (Body Language & Energy)) that Greene argues compounds into a self-fulfilling prophecy of real power. Compare Give Them a Reputation to Live Up To, which applies a structurally similar mechanism outward — giving other people a reputation to live up to — rather than inward at your own self-image.