All sciences are vain and full of errors that are not born of Experience, the mother of all Knowledge.
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.
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.
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.
Science is the captain, and practice the soldiers.
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.
Mechanics is the paradise of the mathematical sciences because by means of it one comes to the fruits of mathematics.
There is no certainty in sciences where one of the mathematical sciences cannot be applied, or which are not in relation with these mathematics.