All people has that characteristic inside their heart, we all tend to covet things not our own, it's from our heart that's the root of all covetousness, envy, jealousy, discontent, clamor, etc. However everybody vary significantly in terms of self control or maturity, some has greater strength at controlling their passions to look outwardly good while others less to no control at all. Even then, controlled or not sin is in the very core of man, and that separates him from his God. Nothing within himself can cure it, it must come from without himself, from some One else (Jesus Christ).