A character is no more a human being than the Venus de Milo is a real woman. A character is a work of art, a metaphor for human nature. We relate to … - Robert McKee

Anxious, inexperienced writers obey rules.
Rebellious, unschooled writers break rules. Artists master the form.

"The famous axiom "Show, don't tell" is the key. Never force words into a character's mouth to tell the audience about world, history, or person. Rather, show us honest, natural scenes in which human beings talk and behave in honest, natural ways...yet at the same time indirectly pass along the necessary facts. In other words, dramatize exposition. Dramatized exposition serves two ends: Its primary purpose is to further the immediate conflict. Its secondary purpose is to convey information. The anxious novice reverses that order, putting expositional duty ahead of dramatic necessity."

We realize we can't go around saying and doing what we're actually thinking and feeling. If we all did that, life would be a lunatic asylum. Indeed, that's how you know you're talking to a lunatic. Lunatics are those poor souls who have lost their inner communication and so they allow themselves to say and do exactly what they are thinking and feeling and that's why they're mad.