There is but one question ...

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 \
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.
 John Ruskin

Quotes from the same author

Sunshine is delicious, rain is refreshing, wind braces us up, snow is exhilarating; there is really no such thing as bad weather, only different kinds of good weather.
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 John Ruskin
Quality is never an accident; it is always the result of intelligent effort.
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 John Ruskin
Give me some mud off a city crossing, some ochre out of a gravel pit and a little whitening and some coal dust and I will paint you a luminous picture if you give me time to gradate my mud and subdue my dust.
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 John Ruskin
Conceit may puff a man up, but never prop him up.
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 John Ruskin
My mother's influence in molding my character was conspicuous. She forced me to learn daily long chapters of the Bible by heart. To that discipline and patient, accurate resolve I owe not only much of my general power of taking pains, but of the best part of my taste for literature.
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 John Ruskin