"In the end, what really matters? Only kindness. Only making sombody a little happier for your presence." Under the Wide and Starry Sky: a novel by Nancy Horan, Ballantine Books, 2011
As, on occasion, I do, I read a book that is completely outside the genres that I normally read; that is, outside what has passed for normal since 2004. Before my retirement from The Little Airplane Company in 2004, my normal genres were non-fictional.
This book is a historical novel based on "...the letters and papers of Robert Louis Stevenson, Fanny Van de Grift Stevenson, their family members and friends." It made for fascinating reading - even to me! The book uses many passages from those writings mentioned, quite skillfully. Although I found the quote from Horan's book, my research did not definitively show that the words are Horan's. On the other hand, I did not find them attributed to either Stevenson; so, I assume that the quote came from Horan's fertile mind. The research did assure me that I was not the only one who noted the words.
Image from Amazon.com, no endorsement implied.