Statement on the doorstep of 10 Downing Street, after her election as Prime Minister, as quoted at  On this day (BBC) http://news.bbc.co.uk/onthisday/hi/dates/stories/may/4/newsid_2503000/2503195.stm. (This is a paraphrasing of a prayer commonly misattributed to St. Francis of Assisi.) 
First term as Prime Minister 
Source: [Who wrote Prayer of St. Francis? Doubtful it was friar, San Diego Union-Tribune, 27 January 2009, 28 July 2019, https://www.sandiegouniontribune.com/sdut-1n27prayer00320-who-wrote-prayer-st-francis-doubtf-2009jan27-htmlstory.html, Lord, make me an instrument of thy peace. Where there is hatred, let me sow love; Where there is injury, pardon; Where there is doubt, faith; Where there is despair, hope; Where there is darkness, light; Where there is sadness, joy.] 
Source: [The real prayer of Francis of Assisi, Howse, Christopher, The Daily Telegraph, 12 April 2013, 28 July 2019, https://www.telegraph.co.uk/news/religion/9991301/The-real-prayer-of-Francis-of-Assisi.html, That was written in 1912, in French, and published in a pious magazine edited by Fr Esther Bouquerel. It was attributed to St Francis in 1927 through its having been printed on the back of a picture of the saint.] 
Source: [Who wrote Prayer of St. Francis? Doubtful it was friar, San Diego Union-Tribune, 27 January 2009, 28 July 2019, https://www.sandiegouniontribune.com/sdut-1n27prayer00320-who-wrote-prayer-st-francis-doubtf-2009jan27-htmlstory.html, An article published last week in L'Osservatore Romano, the Vatican newspaper, said the prayer in its current form dates only from 1912, when it appeared in a French Catholic periodical. ... Although news to many, the truth about the prayer had apparently been hiding in plain sight. “No one among the Franciscans ever thought it really was by St. Francis,” said Giovanni Maria Vian, the editor of L'Osservatore Romano.]
                                    
“When young lips have drunk deep of the bitter waters of hate, suspicion and despair, all the love in the world will not wholly take away that knowledge. Though it may turn darkened eyes for a while to the light, and teach faith where no faith was.”
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Rudyard Kipling 200
English short-story writer, poet, and novelist 1865–1936Related quotes
                                        
                                        1960s, Why I Am Opposed to the War in Vietnam (1967) 
Context: I have not lost faith. I'm not in despair, because I know that there is a moral order. I haven't lost faith, because the arc of the moral universe is long, but it bends toward justice. I can still sing "We Shall Overcome" because Carlyle was right: "No lie can live forever." We shall overcome because William Cullen Bryant was right: "Truth pressed to earth will rise again." We shall overcome because James Russell Lowell was right: "Truth forever on the scaffold, wrong forever on the throne." Yet, that scaffold sways the future. We shall overcome because the bible is right: "You shall reap what you sow." With this faith we will be able to hew out of the mountain of despair a stone of hope. With this faith we will be able to transform the jangling discords of our world into a beautiful symphony of brotherhood. With this faith we will be able to speed up the day when justice will roll down like waters, and righteousness like a mighty stream. With this faith we will be able to speed up the day when the lion and the lamb will lie down together, and every man will sit under his own vine and fig tree, and none shall be afraid because the words of the Lord have spoken it. With this faith we will be able to speed up the day when all over the world we will be able to join hands and sing in the words of the old Negro spiritual, "Free at last! Free at last! Thank God Almighty, we're free at last!" With this faith, we'll sing it as we're getting ready to sing it now. Men will beat their swords into plowshares and their spears into pruning hooks. And nations will not rise up against nations, neither shall they study war anymore. And I don't know about you, I ain't gonna study war no more.
                                    
Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 55.
                                        
                                        Source: The Anatomy of Human Destructiveness (1973), p. 483 
Context: Optimism is an alienated form of faith, pessimism an alienated form of despair. If one truly responds to man and his future, ie, concernedly and "responsibly." one can respond only by faith or by despair. Rational faith as well as rational despair are based on the most thorough, critical knowledge of all the factors that are relevant for the survival of man.
                                    
Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 107
                                        
                                        Widely known as The Prayer of St. Francis, it is not found in Esser's authoritative collection of Francis's writings. 
[Fr. Kajetan, Esser, OFM, ed., Opuscula Sancti Patris Francisci Assisiensis, Rome, Grottaferrata, 1978].  Additionally there is no record of this prayer before the twentieth century. 
[Fr. Regis J., Armstrong, OFM, Francis and Clare: The Complete Works, New York, Paulist Press, 1982, 10, 0-8091-2446-7]. Dr. Christian Renoux of the University of Orleans in France traces the origin of the prayer to an anonymous 1912 contributor to La Clochette, a publication of the Holy Mass League in Paris. It was not until 1927 that it was attributed to St. Francis. 
 The Origin of the Peace Prayer of St. Francis, 2013-06-28, Renoux, Christian http://www.franciscan-archive.org/franciscana/peace.html,. 
[Christian, Renoux, La prière pour la paix attribuée à saint François: une énigme à résoudre, Paris, Editions franciscaines, 2001, 2-85020-096-4]. 
Misattributed
                                    
                                        
                                        "Sappho (Rivers to the Sea)" 
Rivers to the Sea (1915)
                                    
“Some of us have young faith, some broken faith, and some mature faith.”
Where Is God (2009, Thomas Nelson publishers)