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Let proportion be found not only in numbers and measures, but also in sounds, weights, times, and positions, and what ever force there is.

- Leonardo da Vinci

I have offended God and mankind because my work did not reach the quality it should have.

- Leonardo da Vinci

As a well-spent day brings happy sleep, so life well used brings happy death.

- Leonardo da Vinci

It is easier to resist at the beginning than at the end.

- Leonardo da Vinci

The human foot is a masterpiece of engineering and a work of art.

- Leonardo da Vinci

No human investigation can be called real science if it cannot be demonstrated mathematically.

- Leonardo da Vinci

The faculty of imagination is both the rudder and the bridle of the senses.

- Leonardo da Vinci

Thou, O God, dost sell us all good things at the price of labor.

- Leonardo da Vinci

He who loves practice without theory is like the sailor who boards ship without a rudder and compass and never knows where he may cast.

- Leonardo da Vinci

Human subtlety ... will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking, and nothing is superfluous.

- Leonardo da Vinci

Whoever despises the high wisdom of mathematics nourishes himself on delusion and will never still the sophistic sciences whose only product is an eternal uproar.

- Leonardo da Vinci

Mechanics is the paradise of the mathematical sciences, because by means of it one comes to the fruits of mathematics.

- Leonardo da Vinci

O speculators about perpetual motion, how many vain chimeras have you created in the like quest? Go and take your place with the seekers after gold.

- Leonardo da Vinci

O Lord, Thou givest us everything, At the price Of an effort.

- Leonardo da Vinci

You will never have a greater or lesser dominion than that over yourself ... the height of a man's success is gauged by his self-mastery; the depth of his failure by his self-abandonment ... And this law is the expression of eternal justice. He who cannot establish dominion over himself will have no dominion over others.

- Leonardo da Vinci

Obstacles cannot crush me. Every obstacle yields to stern resolve. He who is fixed to a star does not change his mind.

- Leonardo da Vinci

Shun those studies in which the work that results dies with the worker.

- Leonardo da Vinci