Author who penned the line "Sometimes the smallest things take up the most room in your heart" (5)

I believe the answer is:

milne

(Other definitions for milne that I've seen before include "He wrote stories for his son, Christopher Robin" , "Winnie-the-Pooh author" , "Pooh's creator" , "AA man" , "Children's author" .)

I've seen this clue in The New York Times.

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