“Everything you invent is true: you can be sure of that. Poetry is a subject as precise as geometry.”

Source: Flaubert's Parrot

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Julian Barnes77

English writer 1946

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“Everything one invents is true, you may be perfectly sure of that. Poetry is as precise as geometry.”

Gustave Flaubert (1821–1880) French writer (1821–1880)

14 August 1853
Correspondence, Letters to Madame Louise Colet

“Nature, therefore, is subject with absolute precision to all the precepts of geometry as to all the properties of space there demonstrated, this being the subjective condition, not hypothetically but intuitively given, of every phenomenon in which nature can ever be revealed to the senses.”

Immanuel Kant (1724–1804) German philosopher

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

“Be not, O Greeks, so very hostilely disposed towards the Barbarians. To the Babylonians you owe astronomy; to the Persians, magic; to the Egyptians, geometry; to the Phoeicians, instruction by alphabetic writing. Cease, then, to miscall these imitations inventions of your own. Orpheus, again, taught you poetry and song; from him, too, you learned the mysteries.”

Tatian (120–180) Syrian writer

Ante-Nicene Christian library: v. 3 p. 5
Address to the Greeks

“Phys. I know that it is often a help to represent pressure and volume as height and width on paper; and so geometry may have applications to the theory of gases. But is it not going rather far to say that geometry can deal directly with these things and is not necessarily concerned with lengths in space?
Math. No. Geometry is nowadays largely analytical, so that in form as well as in effect, it deals with variables of an unknown nature. …It is literally true that I do not want to know the significance of the variables x, y, z, t that I am discussing. …
Phys. Yours is a strange subject. You told us at the beginning that you are not concerned as to whether your propositions are true, and now you tell us you do not even care to know what you are talking about.
Math.”

Arthur Stanley Eddington (1882–1944) British astrophysicist

That is an excellent description of Pure Mathematics, which has already been given by an eminent mathematician <nowiki>[</nowiki>Bertrand Russell<nowiki>]</nowiki>.
Space, Time and Gravitation (1920)