Did Helen Keller say “We could never learn to be brave and patient if there were only joy in the world.”?

Did Helen Keller say “We could never learn to be brave and patient if there were only joy in the world.”?

Found word for word. Yes. The text appears in works attributed to Helen Keller. Source and location below.

… was small, and before I could read--that everybody was always happy, and at first it made me very sad to know about pain and great sorrow; but now I know that we could never learn to be brave and patient, if there were only joy in the world.
The Story of My Life With her letters (1887-1901) and a supplementary account of her education, including passages from the reports and letters of her teacher, Anne Mansfield Sullivan, by John Albert Macy — Helen Keller, CHAPTER XXIII · ¶522 · Public domain (US), Project Gutenberg #2397 · source

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