Measure what can be measured, and make measureable what cannot be measured.

In the sciences, the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man.

In my studies of astronomy and philosophy I hold this opinion about the universe, that the Sun remains fixed in the centre of the circle of heavenly bodies, without changing its place; and the Earth, turning upon itself, moves round the Sun.

One can understand nature only when one has learned the language and the signs in which it speaks to us; but this language is mathematics and these signs are methematical figures.

Nothing occurs contrary to nature except the impossible, and that never occurs.

Nature...does not act by means of many things when it can do so by means of a few.

They seemed to forget that the increase of known truths stimulates the investigation, establishment and growth of the arts; not their dimination or destruction.