Sincerity doesn't mean anything. A person can be sincere and be more destructive than a person who is insincere.
Edward AlbeeMartha: Truth or illusion, George; you don't know the difference. George: No, but we must carry on as though we did. Martha: Amen.
Edward AlbeeThe playwright, along with any writer, composer, painter in this society, has got to have a terribly private view of his own value, of his own work. He's got to listen to his own voice primarily. He's got to watch out for fads, for what might be called the critical aesthetics.
Edward Albee