The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
“Talk not of love: thou never knew'st its force.”
            Act III, scene ii. 
Cato, A Tragedy (1713)
        
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Joseph Addison 226
politician, writer and playwright 1672–1719Related quotes
“Love's action. It isn't talk and it never has been.”
Source: Beach Music
                                
                                    “Hast thou named all the birds without a gun;
Loved the wood-rose, and left it on its stalk.”
                                
                                
                                
                                
                            
                                        
                                         Forbearance http://www.emersoncentral.com/poems/forebearance.htm 
1840s, Poems (1847)
                                    
                                        
                                        Tu só, tu, puro Amor... 
Stanza 119, line 1 (tr. Richard Francis Burton) 
Epic poetry, Os Lusíadas (1572), Canto III
                                    
                                        
                                        "Be Strong". 
Legends and Lyrics: A Book of Verses (1858)
                                    
                                        
                                         Tractatus VII, 8 http://www.newadvent.org/fathers/170207.htm 
Latin: "dilige et quod vis fac."; falsely often: "ama et fac quod vis." 
Translation by Professor Joseph Fletcher: Love and then what you will, do. 
In epistolam Ioannis ad Parthos
                                    
                                        
                                        p 438 
On the Mystical Body of Christ 
Context: Choose to love whomsoever thou wilt: all else will follow. Thou mayest say, "I love only God, God the Father." Wrong! If Thou lovest Him, thou dost not love Him alone; but if thou lovest the Father, thou lovest also the Son. Or thou mayest say, "I love the Father and I love the Son, but these alone; God the Father and God the Son, our Lord Jesus Christ who ascended into heaven and sitteth at the right hand of the Father, the Word by whom all things were made, the Word who was made flesh and dwelt amongst us; only these do I love." Wrong again! If thou lovest the Head, thou lovest also the members; if thou lovest not the members, neither dost thou love the Head.