Quelli che s’innamorano della pratica senza la scienza, sono come i nocchieri che entrano in naviglio senza timone o bussola, che mai hanno certezza dove si vadano. Sempre la pratica dev’essere edificata sopra la buona teorica, della quale la prospettiva è guida e porta, e senza questa nulla si fa bene.

Leonardo da Vinci Trattato della Pittura - Parte II (Perfect Library)
Also known as: Leonardo di ser Piero da Vinci
Italian
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About Leonardo da Vinci

Leonardo di ser Piero da Vinci (15 April 1452 – 2 May 1519) was an Italian Renaissance painter, architect, inventor, engineer, sculptor, and musician. His best known painting is the Mona Lisa.

Biography information from Wikiquote

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Additional quotes by Leonardo da Vinci

In the days of thy youth seek to obtain that which shall compensate the losses of thy old age. And if thou understandest that old age is fed with wisdom, so conduct thyself in the days of thy youth that sustenance may not be lacking to thy old age.

The eye sees a thing more clearly in dreams, than the imagination awake.

It was the opinion of Leonardo that the temporary nature of music caused its inferiority to painting. Although durability was in itself no absolute test, — else the work of coppersmiths would be the highest art, — yet in any final scale, permanence could not altogether be disregarded. Music perished in the very act of its creation, while painting preserved the beautiful from the hand of time.