Those skilled in mathematical analysis know that its object is not simply to calculate numbers, but that it is also employed to find the relations between magnitudes which cannot be expressed in numbers and between functions whose law is not capable of algebraic expression.

p. 3 ; Cited in: Robert Edouard Moritz. Memorabilia mathematica; or, The philomath's quotation-book, (1914) p. 33: About the nature of mathematics - Researches into the Mathematical Principles of the Theory of Wealth, 1897

Memorabilia mathematica; or, The philomath's quotation-book