Mirren traced this advice back sixty years to her grammar school headmistress, Mother Mary Mildred — 'an ancient nun, is there any other type?' — who said those words to a trembling eleven-year-old Helen entering high school. She carried the lesson through her entire career. Mirren added a practical caveat: sometimes fear is wise, like when you're about to dive into a pool without enough water or drive drunk. But for the fears that really plague you — 'Am I good enough? Am I smart enough? Will I fail?' — the only answer is to charge forward.