“Begin with the simplest examples.”
Immer mit den einfachsten Beispielen anfangen.
Hilbert-Courant (1984) by Constance Reid, p. 104; German version quoted in Algebra by Michael Artin
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Immer mit den einfachsten Beispielen anfangen.
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David Hilbert 30
German prominent mathematician 1862–1943Related quotes

Arp's quote, on the cooperation with his future wife Sophie Taeuber ca. 1916; as quoted in: Abstract Art, Anna Moszynska, Thames and Hudson, London, 1990, p. 65
1910-20s

Source: Essays in tektology, 1980, p. 195, as cited in: Arran Gare, " Aleksandr Bogdanov and systems theory http://aaltowebstudio.cloudapp.net/tangentialpoints/wp-content/uploads/sites/3/2014/05/Arren-Gare-2000-Aleksandr-Bogdanov-and-Systems-Theory.pdf." Democracy & Nature 6.3 (2000): 341-359.
Source: Personal Destinies: A Philosophy of Ethical Individualism (1976), p. 80

Sometimes presented in paraphrased form, such as "Example is not the main thing in influencing others, it is the only thing" https://books.google.com/books?id=5Za7o6teOHoC&pg=PR18&dq=%22example+is+not+the+main+thing%22+schweitzer&hl=en&sa=X&ved=0ahUKEwjFh4m9vqvMAhUG02MKHRqZDtsQ6AEIMzAE#v=onepage&q=%22example%20is%20not%20the%20main%20thing%22%20&f=false.
God's Own Man (1952)

“I… present also examples of historic interest, examples of real mathematical beauty”
Induction and Analogy in Mathematics (1954)
Context: I... present also examples of historic interest, examples of real mathematical beauty, and examples illustrating the parallelism of the procedures in other sciences, or in everyday life.

William Stanley Jevons Letter to his brother (1 June 1860), published in Letters and Journal of W. Stanley Jevons (1886), edited by Harriet A. Jevons, his wife, p. 151 - 152.