In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.

Galileo Galilei

Measure what is measurable, and make measurable what is not so.

Galileo Galilei

We must say that there are as many squares as there are numbers.

Galileo Galilei

I cannot without great astonishment — I might say without great insult to my intelligence — hear it attributed as a prime perfection and nobility of the natural and integral bodies of the universe that they are invariant, immutable, inalterable, etc., while on the other hand it is called a great imperfection to be alterable, generable, mutable, etc. For my part I consider the earth very noble and admirable precisely because of the diverse alterations, changes, generations, etc. that occur in it incessantly.

Galileo Galilei