Margaret. - With 53-across, author of the quote

Word by letter:

• Margaret. - Letter on M
• 1 - st. word M
• 2 - st. word A
• 3 - st. word R
• 4 - st. word G
• 5 - st. word A
• 6 - st. word R
• 7 - st. word E
• 8 - st. word T
• 9 - st. word .