Introduction, The Nature of Probability Theory, p. 3.
An Introduction To Probability Theory And Its Applications (Third Edition)
“The bewildered novice in chess moves cautiously, recalling individual rules, whereas the experienced player absorbs a complicated situation at a glance and is unable to account rationally for his intuition. In like manner mathematical intuition grows with experience, and it is possible to develop a natural feeling for concepts such as four dimensional space.”
Introduction, The Nature of Probability Theory, p. 2.
An Introduction To Probability Theory And Its Applications (Third Edition)
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William Feller 30
Croatian-American mathematician 1906–1970Related quotes

“Just as feelings grow out of ignorance, intuition should grow out of knowledge.”
Annotated Drawings by Eugene J. Martin: 1977-1978
Source: What Is This Thing Called Science? (Third Edition; 1999), Chapter 1, Science as knowledge derived form the facts of experience, p. 8.

Part II. Ch. 2 : Mathematical Definitions and Education, p. 128
Variant translation: The chief aim of mathematics teaching is to develop certain faculties of the mind, and among these intuition is by no means the least valuable.
Science and Method (1908)
Context: The principal aim of mathematical education is to develop certain faculties of the mind, and among these intuition is not the least precious. It is through it that the mathematical world remains in touch with the real world, and even if pure mathematics could do without it, we should still have to have recourse to it to fill up the gulf that separates the symbol from reality.
Source: "Games with Incomplete Information," 1997, p. 136

Kant's Inaugural Dissertation (1770), Section III On The Principles Of The Form Of The Sensible World

Internet Encyclopedia of Philosophy
Diederik Aerts (2001) " Time, space and reality : an analysis from physics. http://www.vub.ac.be/CLEA/aerts/publications/2001TimeSpaceReality.pdf"

The Text-Critical Use of the Septuagint, 2nd ed. (1997), p.232