We ain’t heavy we’re brothers
In 1884, James Wells, Moderator of the United Free Church of Scotland, in his book The Parables of Jesus tells the story of a little girl carrying a big baby boy. Seeing her struggling, someone asked if she wasn’t tired. With surprise she replied, “No, he’s not heavy; he’s my brother.”
In a 1918 publication by Ralph Waldo Trine titled The Higher Powers of Mind and Spirit, he relates the following anecdote: “Do you know that incident in connection with the little Scottish girl? She was trudging along, carrying as best she could a boy younger, but it seemed almost as big as she herself, when one remarked to her how heavy he must be for her to carry, when instantly came the reply: ‘He’s na heavy. He’s mi brither.'”
The first editor of Kiwanis magazine, Roe Fulkerson, published a column in September 1924 carrying the title “He Ain’t Heavy, He’s My Brother”, the first use of the phrase exactly as it is rendered in the song title.