Quotes by Roger Bacon, The Opus Majus of Roger Bacon

“Now there are four chief obstacles in grasping truth, which hinder every man, however learned, and scarcely allow anyone to win a clear title to learning, namely, submission to faulty and unworthy ...”

“The conquest of learning is achieved through the knowledge of languages.”

“If 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...”