Mathematical science shows what is. It is the language of unseen relations between things.

Ada, Countess of Lovelace, quoted in Dorothy Stein (ed.): Ada: A Life and a Legacy (1985)

That is the essence of science: Ask an impertinent question, and you are on the way to a pertinent answer.

Jacob Bronowski: The Ascent of Man (1973)

Hofstadter’s Law: It always takes longer than you expect, even when you take into account Hofstadter’s Law.

Douglas R. Hofstadter: Gödel, Escher, Bach: An Eternal Golden Braid (1979)

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