But concerning vision alone is a separate science formed among philosophers, namely, optics, and not concerning any other sense ... It is… — Roger Bacon Copy Share Image
There are two modes of knowledge: through argument and through experience. Argument brings conclusions and compels us to concede them, but it… — Roger Bacon Copy Share Image
First, by the figurations of art there be made instruments of navigation without men to row them, as great ships to brooke… — Roger Bacon Copy Share Image
Argument is conclusive, but it does not remove doubt, so that the mind may rest in the sure knowledge of the truth,… — Roger Bacon Copy Share Image
There are two modes of acquiring knowledge, namely by reasoning and experience. Reasoning draws a conclusion and makes us grant the conclusion,… — Roger Bacon Copy Share Image
[I]f in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundations of knowledge… — Roger Bacon Copy Share Image
It is not necessarily impossible for human beings to fly, but it so happens that God did not give them the knowledge of how… — Roger Bacon Copy Share Image
“Now there are four chief obstacles in grasping truth, which hinder every man, however learned, and scarcely allow anyone to win a clear title… — Roger Bacon Copy Share Image
There are four great sciences, without which the other sciences cannot be known nor a knowledge of things secured ... Of these sciences the… — Roger Bacon Copy Share Image
There are in fact four very significant stumbling blocks in the way of grasping the truth, which hinder every man however learned, and scarcely… — Roger Bacon Copy Share Image
All science requires mathematics. [Editors' summary of Bacon's idea, not Bacon's wording.] — Roger Bacon Copy Share Image
If in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundation of knowledge… — Roger Bacon Copy Share Image
There are in fact four very significant stumblingblocks in the way of grasping the truth, which hinder every man however learned, and scarcely allow… — Roger Bacon Copy Share Image
It is easier for a man to burn down his own house than to get rid of his prejudices. — Roger Bacon Copy Share Image
![“[I]f in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundations of knowledge in mathematics, in so far as disposed through it we are able to reach certainty in other sciences and truth by the exclusion of error.” quote by Roger Bacon](https://sms4smile.com/quotes/img-quotes/d13/roger-bacon-15067_able_i-f-in-other-sciences-we-should-arrive-a_24209.jpg)
![“There are four great sciences, without which the other sciences cannot be known nor a knowledge of things secured ... Of these sciences the gate and key is mathematics ... He who is ignorant of this [mathematics] cannot know the other sciences nor the affairs of this world.” quote by Roger Bacon](https://sms4smile.com/quotes/img-quotes/555/roger-bacon-15067_affair_there-are-four-great-sciences-without-wh_575596.jpg)
![“All science requires mathematics. [Editors' summary of Bacon's idea, not Bacon's wording.]” quote by Roger Bacon](https://sms4smile.com/quotes/img-quotes/49e/roger-bacon-15067_editors_all-science-requires-mathematics-editors_697422.jpg)
