Book II, ch. 3 (trans. Constance Garnett)
The Elder Zossima, speaking to a devout widow afraid of death 
The Brothers Karamazov (1879–1880) 
Context: If you are penitent, you love. And if you love you are of God. All things are atoned for, all things are saved by love. If I, a sinner even as you are, am tender with you and have pity on you, how much more will God have pity upon you. Love is such a priceless treasure that you can redeem the whole world by it, and cleanse not only your own sins but the sins of others.
                                    
“The sins of others can never become the measure of your own.”
Source: Lumina and New Lumina (1969), p. 35
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Adrienne von Speyr 24
Swiss doctor and mystic 1902–1967Related quotes
Source: The Ascetical Homilies of Saint Isaac the Syrian, p. 115
“Men do not know how to appreciate or measure luck except that of others. Their own never.”
                                        
                                        History of the Greeks, Rizzoli 1959. 
1950s - 1990s
                                    
                                        
                                        Book I, ch. 16 (p. 18) 
The Ladder of Perfection (1494) 
Context: A venial sin of your own is a greater obstacle to your experiencing the love of Jesus Christ than the sin of anyone else, however great it may be. It is clear, then, that you must harden your heart against yourself, humbling and detesting yourself more strongly for all the sins that hold you back from the vision of God than you detest the sins of others. For if your own heart is free from sin, the sins of others will not hurt you. Therefore, if you wish to find peace, both in this life and in heaven, follow the advice of one of the holy fathers, and say each day: "What am I?" and do not judge others.
                                    
                                        
                                        Christopher Hitchens vs. William Dembski, 18/11/2010  http://www.youtube.com/watch?v=ctuloBOYolE&t=14m12s 
2010s, 2010