“The sidelines may be safer but life is played on the field”

Source: Night Game

as translated by Martin H. Krieger "A 1940 letter of André Weil on analogy in mathematics." http://www.ams.org/notices/200503/fea-weil.pdf Notices of the AMS 52, no. 3 (2005) pp. 334–341, quote on p. 340

As quoted in The New York Times (26 December 1886), and in Words on Wellington (1889) by Sir William Fraser, this is almost certainly apocryphal. The first attributions of such a remark to Wellington were in De l'Avenir politique de l'Angleterre (1856) by Charles de Montalembert, Ch. 10, where it is stated that on returning to Eton in old age he had said: "C'est ici qu'a été gagnée la bataille de Waterloo." This was afterwards quoted in Self-Help (1859) by Samuel Smiles as "It was there that the Battle of Waterloo was won!" Later in Memoirs of Eminent Etonians (2nd Edition, 1876) by Sir Edward Creasy, he is quoted as saying as he passed groups playing cricket on the playing-fields: "There grows the stuff that won Waterloo."
Elizabeth Longford in Wellington — The Years of the Sword (1969) states he "probably never said or thought anything of the kind" and Gerald Wellesley, 7th Duke of Wellington in a letter published in The Times in 1972 is quoted as stating: "During his old age Wellington is recorded to have visited Eton on two occasions only and it is unlikely that he came more often. … Wellington's career at Eton was short and inglorious and, unlike his elder brother, he had no particular affection for the place. … Quite apart from the fact that the authority for attributing the words to Wellington is of the flimsiest description, to anyone who knows his turn of phrase they ring entirely false."
Misattributed

The Churn (2014)

Address to the US Green Party

As paraphrased and quoted in "Sidelight on Sports: A Baseball Star is Born" https://news.google.com/newspapers?id=d5dRAAAAIBAJ&sjid=52sDAAAAIBAJ&pg=1293%2C4057980 by Al Abrams, in The Pittsburgh Post-Gazette (Tuesday, June 7, 1955), p. 20
Baseball-related, <big><big>1950s</big></big>, <big>1955</big>
Context: Four years ago he was playing amateur softball in Puerto Rico. "I peetch and play shortstop," he said of his early days. "I no play outfield until pro ball." Roberto turned pro in 1952 with Santurce and last year played winter ball for that team with Willie Mays. Herman Franks, Giant coach, was the manager. "Wee-lee May and Herm Frank help me," he answered when I asked him if he had been given special instruction in the game by anyone. "May show me how to field and throw," he added. Did Mays or anyone show him how to hit? "No," he replied, pride in his voice. "I learn to heet myself. Nobody show me."

Source: The Conquest of Bread (1892), Ch. 1 : Our Riches, p. 59