what does "The iron has entered into my soul"here mean?
"I'm awfully sorry I made fun of your hair, Anne," he whispered
contritely. "Honest I am. Don't be mad for keeps, now."
Anne swept by disdainfully, without look or sign of hearing. "Oh
how could you, Anne?" breathed Diana as they went down the road half
reproachfully, half admiringly. Diana felt that SHE could never have
resisted Gilbert's plea.
"I shall never forgive Gilbert Blythe," said Anne firmly. "And Mr.
Phillips spelled my name without an e, too. The iron has entered into my
soul, Diana."