"Francis Jane Crosby wrote more than 9,000 hymns, some of which are among the most popular in every Christian denomination. She wrote so many that she was forced to use pen names lest the hymnals be filled with her name above all others. And, for most people, the most remarkable thing about her was that she had done so in spite of her blindness." CT 

https://www.christianitytoday.com/history/people/poets/fanny-crosby.html