Personality is easy to read, and we’re all experts at it. We judge people funny, extroverted, energetic, optimistic, confident—as well as overly serious, lazy, negative, and shy—if not upon first meeting them, then shortly thereafter. And though we may need more than one interaction to confirm the presence of these sorts of traits, by the time we decide they are, in fact, present we’ve usually amassed enough data to justify our conclusions.
Character, on the other hand, takes far longer to puzzle out. It includes traits that reveal themselves only in specific—and often uncommon—circumstances, traits like honesty, virtue, and kindliness. Ironically, research has shown that personality traits are determined largely by heredity and are mostly immutable. The arguably more important traits of character, on the other hand, are more malleable—though, we should note, alterable not without great effort. Character traits, as opposed to personality traits, are based on beliefs (e.g., that honesty and treating others well is important—or not), and though beliefs can be changed, it’s far harder than most realize.
(Source: happinessinthisworld.com)