Cited in: Carol A. Dingle (2000) Memorable Quotations: Philosophers of Western Civilization. p. 21
“The strongest argument proves nothing so long as the conclusions are not verified by experience.”
            OQHI,  43 http://www.mlat.uzh.ch/MLS/text.php?tabelle=Rogerus_Baco_cps4&rumpfid=Rogerus_Baco_cps4,%20Opus%20tertium,%20%2013&level=3&corpus=4&lang=0¤t_title=Opus%20tertium&links=&inframe=1&hide_apparatus= as cited in: James J. Walsch (1911) """"Science at the Medieval Universities"""" in: Popular Science, May 1911,  p. 449 http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_78.djvu/459 
Opus Tertium, c. 1267 
Context: The strongest argument proves nothing so long as the conclusions are not verified by experience. Experimental science is the queen of sciences, and the goal of all speculation.
        
Original
[H]aec vocatur scientia experimentalis, quae negligit argumenta, quoniam non certificant, quantumcunque sint fortia, nisi simul adsit experientia conclusionis. Et ideo haec docet experiri conclusiones nobiles omnium scientiarum, quae in aliis scientiis aut probantur per argumenta, aut investigantur per experientias naturales et imperfectas...
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Roger Bacon 21
medieval philosopher and theologian 1220–1292Related quotes
Patheos, The Cow http://www.patheos.com/blogs/reasonadvocates/2016/01/22/the-cow/ (January 22, 2016)
“The truth is always the strongest argument.”
                                        
                                        Fragment 737. 
Phædra
                                    
                                        
                                        New York September 7, 2000 Asia Society Annual Dinner 
Quotes from ataljee.org
                                    
“The strongest argument in favor of the gospel is a loving and lovable Christian.”
The Ministry of Healing, p. 470
Source: Culture and Value (1980), p. 14e