
Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.Leonardo da Vinci
Leonardo da Vinci was an Italian Renaissance painter, engineer and anatomist whose notebooks reveal an insatiable curiosity about nature and art. He painted the Mona Lisa and The Last Supper, and filled thousands of pages with studies, inventions and observations.
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Source: The Notebooks of Leonardo da Vinci · ✓ Source verified

Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.Leonardo da Vinci
Nothing strengthens authority so much as silence.Leonardo da Vinci
He who is fixed to a star does not change his mind.Leonardo da Vinci

The greatest deception men suffer is from their own opinions.Leonardo da Vinci

Nature never breaks her own laws.Leonardo da Vinci

Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.Leonardo da Vinci

Nature is the source of all true knowledge.Leonardo da Vinci

He who loves practice without theory is like the sailor who boards ship without a rudder and compass.Leonardo da Vinci