See Now The Power Of Truth.

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.

Alas! Your Dear Friend And Servant Galileo Has Been For The Last Month Hopelessly Blind; So That This Heaven, This Earth, This Universe, Which I By My Marvelous Discoveries And Clear Demonstrations Had Enlarged A Hundred Thousand Times Beyond The Belief Of The Wise Men Of Bygone Ages, Henceforward For Me Is Shrunk Into Such A Small Space As Is Filled By My Own Bodily Sensations.

I Have Never Met A Man So Ignorant That I Couldn't Learn Something From Him.

Nature Is Written In Mathematical Language.

Philosophy Itself Cannot But Benefit From Our Disputes, For If Our Conceptions Prove True, New Achievements Will Be Made; If False, Their Refutation Will Further Confirm The Original Doctrines.