Science is the captain, and practice the soldiers.
Leonardo da Vinci
Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.
Truth here makes Falsehood torment lying tongues.
Fire destroys all sophistry, that is deceit; and maintains truth alone, that is gold.
Fire is to represent truth because it destroys all sophistry and lies; and the mask is for lying and falsehood which conceal truth.
There is no certainty in sciences where one of the mathematical sciences cannot be applied, or which are not in relation with these mathematics.
Do not reveal, if liberty is precious to you; my face is the prison of love.
The man who blames the supreme certainty of mathematics feeds on confusion, and can never silence the contradictions of sophistical sciences which lead to an eternal quackery.
Man has much power of discourse which for the most part is vain and false; animals have but little, but it is useful and true, and a small truth is better than a great lie.
To lie is so vile, that even if it were in speaking well of godly things it would take off something from God's grace; and Truth is so excellent, that if it praises but small things they become noble.
Fire destroys falsehood, that is sophistry, and restores truth, driving out darkness.
I am not to blame for putting forward, in the course of my work on science, any general rule derived from a previous conclusion.
The Book of the science of Mechanics must precede the Book of useful inventions.
Truth at last cannot be hidden. Dissimulation is of no avail. Dissimulation is to no purpose before so great a judge. Falsehood puts on a mask. Nothing is hidden under the sun.
The city will gain beauty worthy of its name and to you it will be useful by its revenues, and the eternal fame of its aggrandizement.
All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.
Science is the observation of things possible, whether present or past; prescience is the knowledge of things which may come to pass, though but slowly.
As a day well spent procures a happy sleep, so a life well employed procures a happy death.
Those who fall in love with practice without science are like a sailor who enters a ship without a helm or a compass, and who never can be certain whither he is going.
We, by our arts may be called the grandsons of God.
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