“The theory of probability can never lead to a definite statement concerning a single event.”

— Richard von Mises

Second Lecture, The Elements of the Theory of Probability, p. 33
Probability, Statistics And Truth - Second Revised English Edition - (1957)

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Richard von Mises 20

Austrian physicist and mathematician 1883–1953

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“A distinguished writer (Siméon Denis Poisson) has thus stated the fundamental definitions of the science:
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“Probability is expectation founded upon partial knowledge. A perfect acquaintance with all the circumstances affecting the occurrence of an event would change expectation into certainty, and leave neither room nor demand for a theory of probabilities.”

George Boole (1815–1864) English mathematician, philosopher and logician

Source: 1850s, An Investigation of the Laws of Thought (1854), p. 244; Cited in: Michael J. Katz (1986) Templets and the Explanation of Complex Patterns, p. 123