“If you have weapons, take them home; if you do not have them, please do not seek to get them. We cannot solve this problem through retaliatory violence. We must meet violence with nonviolence. Remember the words of Jesus: «He who lives by the sword will perish by the sword». We must love our white brothers, no matter what they do to us. We must make them know that we love them. Jesus still cries out in words that echo across the centuries: «Love your enemies; bless them that curse you; pray for them that despitefully use you». This is what we must live by. We must meet hate with love. Remember, if I am stopped, this movement will not stop, because God is with the movement. Go home with this glowing faith and this radiant assurance.”

1960s, Letter from a Birmingham Jail (1963)
Context: But though I was initially disappointed at being categorized as an extremist, as I continued to think about the matter I gradually gained a measure of satisfaction from the label. Was not Jesus an extremist for love: "Love your enemies, bless them that curse you, do good to them that hate you, and pray for them which despitefully use you, and persecute you." Was not Amos an extremist for justice: "Let justice roll down like waters and righteousness like an ever flowing stream." Was not Paul an extremist for the Christian gospel: "I bear in my body the marks of the Lord Jesus." Was not Martin Luther an extremist: "Here I stand; I cannot do otherwise, so help me God." And John Bunyan: "I will stay in jail to the end of my days before I make a butchery of my conscience." And Abraham Lincoln: "This nation cannot survive half slave and half free." And Thomas Jefferson: "We hold these truths to be self evident, that all men are created equal..." So the question is not whether we will be extremists, but what kind of extremists we will be. Will we be extremists for hate or for love? Will we be extremists for the preservation of injustice or for the extension of justice? In that dramatic scene on Calvary's hill three men were crucified. We must never forget that all three were crucified for the same crime — the crime of extremism. Two were extremists for immorality, and thus fell below their environment. The other, Jesus Christ, was an extremist for love, truth and goodness, and thereby rose above his environment. Perhaps the South, the nation and the world are in dire need of creative extremists.

Lessons of Dr. Martin Luther King, Jr. (1990)

Oscar A. Romero, The Violence of Love http://data.plough.com/ebooks/ViolenceOfLove.pdf (1977).

Catholic Worker (April 1964)

Hermann und Dorothea (1797)

Variant: Love who you love while you have them. That's all you can do. Let them go when you must. If you know how to love, you'll never run out.
Source: My Name Is Memory

1950s, Loving Your Enemies (Christmas 1957)

The Big Picture, 1996
1990s, 1990
Source: [Pierce, 1976-2002, 125]