Therefore, When I Considered This Carefully, The

Perhaps There Will Be Prattlers Who, Although Completely Ignorant Of Mathematics, Nevertheless Take It Upon Themselves To Pass Judgment On Mathematical Questions, And On Account Of Some Passage In Scripture, Badly Distorted To Their Purpose, Will Dare To Censure And Assail What I Have Presented Here.

Of All Things Visible, The Highest Is The Heaven Of The Fixed Stars.

Although All The Good Arts Serve To Draw Man's Mind Away From Vices And Lead It Toward Better Things, This Function Can Be More Fully Performed By This Art, Which Also Provides Extraordinary Intellectual Pleasure.

Mathemata Mathematicis Scribuntur Mathematics Is Written For Mathematicians De Revolutionibus

For It Is The Duty Of An Astronomer To Compose The History Of The Celestial Motions Through Careful And Expert Study.