Analysis of information sources in references of the Wikipedia article "Smedley Butler" in English language version.
(p.1) ...Vanderbilt's story of the Mussolini incident was as follows: I was riding with Mussolini, who drove. A small child ran in front of the machine at a sharp turn in the run and was hit. I looked back to see if the child was hurt. Mussolini put his hand on my knee and said 'Never look back, Vanderbilt, always look ahead in life.'