Book III. Concerning Petitions and Axioms.
The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 2 (1789)
“There is but one question ultimately to be asked respecting every line you draw, Is it right or wrong? If right, it most assuredly is not a "free" line, but an intensely continent, restrained and considered line; and the action of the hand in laying it is just as decisive, and just as "free" as the hand of a first-rate surgeon in a critical incision.”
Cestus of Aglaia, chapter VI, section 72 (1865-66).
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John Ruskin 133
English writer and art critic 1819–1900Related quotes

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Tractatus de Configurationibus et Qualitatibus et Motuum (c. 1350)
And after this manner, Euclid, in the sixth book, mentions both excess and defect. But in the present problem he requires application...
The Philosophical and Mathematical Commentaries of Proclus on the First Book of Euclid's Elements Vol. 2 (1789)

Interview by Adam Holdorf for Real Change News, (18 March 2004).