Definition
Grandiosity is a swelling of the self-image in which a person quietly believes they are more talented, more important, or more destined for greatness than the evidence supports. It is fed by praise, early success, and the natural human wish to feel exceptional.
In moderate doses everyone carries some grandiosity — it is the engine of ambition. It becomes dangerous when the inflated self-image detaches from feedback, so the person stops hearing criticism, overestimates their reach, and takes on projects far beyond their real capacity.
Why it matters
How it works
Grandiosity grows whenever the self receives reward without corresponding reality-testing. A run of luck, flattering followers, or a culture of constant validation lets the imagined self drift upward. Because the feeling is pleasant, the mind protects it, screening out evidence of limits.
The corrective is what Greene calls converting grandiosity into its practical form: channelling the surplus energy into concrete, measurable work and welcoming the feedback that work produces. Reality then becomes a partner rather than an enemy.