Philosophy is written in that great book which ever lies before our eyes — I mean the universe — but we cannot understand it if we do not first learn… - Galileo Galilei

Philosophy is written in that great book which ever lies before our eyes — I mean the universe — but we cannot understand it if we do not first learn the language and grasp the symbols, in which it is written

Philosophy is written in this all-encompassing book that is constantly open to our eyes, that is the universe; but it cannot be understood unless one first learns to understand the language and knows the characters in which it is written. It is written in mathematical language, and its characters are triangles, circles, and other geometrical figures; without these it is humanly impossible to understand a word of it, and one wanders in a dark labyrinth.

Philosophy is written in this grand book, which stands continually open before our eyes (I say the 'Universe'), but can not be understood without first learning to comprehend the language and know the characters as it is written. It is written in mathematical language, and its characters are triangles, circles and other geometric figures, without which it is impossible to humanly understand a word; without these one is wandering in a dark labyrinth.

I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments and demonstrations.

Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards.

By denying scientific principles, one may maintain any paradox.