“Music, to create harmony, must investigate discord.”
“Fragment 3. The harmony is generally the result of contraries; for it is the unity of multiplicity, and the agreement of discordances.”
            Nicom.Arith.2:509 
The Life of Pythagoras (1919)
        
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Philolaus 7
ancient greek philosopher -470–-390 BCRelated quotes
Source: 1910s, Ads and Sales (1911), p. 8
                                
                                    “What the discordant harmony of circumstances would and could effect.”
                                
                                
                                
                                
                                    
                                    Quid velit et possit rerum concordia discors
                                
                            
                                        
                                        Book I, epistle xii, line 19 
Epistles (c. 20 BC and 14 BC)
                                    
Opening address to the National Day of Prayer in Suva, 15 May 2005 (excerpts) http://www.fiji.gov.fj/publish/page_4607.shtml
“Every discord is a harmony not understood. Happiness is a disease, and pain, a medicine.”
The Way to Peace, Power and Long Life (1945), p. 121 (2001 edition)
“Opposition brings concord. Out of discord comes the fairest harmony.”
                                        
                                        As translated by Philip Wheelwright in  Heraclitus (1959) https://archive.org/details/heraclitus00whee 
Disputed
                                    
                                        
                                        Source: A Thousand-Mile Walk To the Gulf, 1916, chapter 7: A Sojourn in Cubapage 168, omits the "all".  This is a typo: see 1916 edition page 164 
Source: The Wilderness World of John Muir
                                    
Source: The Limits of State Action (1792), Ch. 8
“Harmony is pure love, for love is complete agreement.”
                                        
                                        Armonía es puro amor, porque el amor es concierto. 
Fuenteovejuna (1613), Barrildo, Act I.
                                    
                                
                                    “For harmony makes small states great, while discord undermines the mightiest empires.”
                                
                                
                                
                                
                                    
                                    Nam concordia parvae res crescunt, discordia maxumae dilabuntur.
                                
                            
                                        
                                        X.6 
Bellum Iugurthinum