A large share of King's most quoted lines on justice come from a single document: the Letter from Birmingham Jail, written in April 1963 during an eight-day stretch in a Birmingham city jail. He'd been arrested for demonstrating without a permit, and he wrote the letter partly in response to eight white Alabama clergymen who had published a statement calling his campaign "unwise and untimely." King's answer, drafted in the margins of a newspaper and on scraps smuggled in by his lawyers, laid out the case for civil disobedience in more detail than almost anything else he wrote: why waiting for injustice to correct itself doesn't work, what separates a just law from an unjust one, and why breaking an unjust law openly, and accepting the punishment for it, is itself an act of respect for law rather than an attack on it. Quotes below that aren't tagged to the letter come mostly from the March on Washington and a handful of later speeches.
“Injustice anywhere is a threat to justice everywhere.”
King wrote the letter in April 1963 from a Birmingham jail cell, answering eight white clergymen who had publicly called his demonstrations "unwise and untimely." The line argues that injustice isn't a local, containable problem — it sets a precedent everywhere it's allowed to stand.
“The arc of the moral universe is long, but it bends toward justice.”
The phrase didn't originate with King. It traces back to the Unitarian minister Theodore Parker, who wrote a longer version of it in an 1853 sermon. King shortened it and used it often enough through the 1960s that it's now remembered as his.
“True peace is not merely the absence of tension; it is the presence of justice.”
“Justice too long delayed is justice denied.”
“A right delayed is a right denied.”
“We must come to see that human progress never rolls in on wheels of inevitability; it comes through the tireless efforts of men willing to be co-workers with God.”
“Injustice anywhere is a threat to justice everywhere. We are caught in an inescapable network of mutuality, tied in a single garment of destiny.”
“One has not only a legal but a moral responsibility to obey just laws. Conversely, one has a moral responsibility to disobey unjust laws.”
This sentence carries the core argument of the letter: breaking an unjust law in the open, and accepting the legal penalty for it, is not lawlessness. King treated it as the opposite — the highest possible respect for the idea of law, done to expose a law that didn't deserve the name.
“An unjust law is a code that a numerical or power majority group compels a minority group to obey but does not make binding on itself.”
This is King's working definition of an unjust law, offered a few paragraphs after he's asked why anyone should get to decide which laws to follow. His test: a law written by a majority that exempts itself from the rule it imposes on a minority fails on its face, regardless of whether it was passed through a legal process.
“The time is always right to do what is right.”
“Never forget that everything Hitler did in Germany was legal.”
King used this as his sharpest rebuttal to the argument that his protests should wait for the courts and legislatures to act on their own timeline. His point: legality and morality are two different tests, and a government can pass a law that is entirely legal and entirely wrong.
“I am not unmindful that some of you have come here out of great trials and tribulations.”
“Whatever affects one directly, affects all indirectly.”
“Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed.”
Injustice anywhere is a threat to justice everywhere.
Dr. Martin Luther King, Jr.
Sourced lines on justice, most of them drawn from a single document written in a Birmingham jail cell in April 1963.
The Letter from Birmingham Jail
King wrote this letter in April 1963 while he was in jail for taking part in a nonviolent protest. It is the source of most of his best-known justice quotes, including "injustice anywhere is a threat to justice everywhere" and "justice too long delayed is justice denied." It is worth reading the whole letter, not just the lines people quote from it, since King spends most of it answering a specific argument: that a minority group should wait for change to come through the courts rather than force the issue in the streets.
Related Quotes on Justice
King rarely wrote about justice in isolation. It sits right next to freedom, equality, and nonviolence in almost everything he said, since he treated them as parts of the same argument rather than separate topics. The quotes below aren't filed under "justice" in his own writing, but they're the same case made from a different angle.
“Free at last, free at last, thank God Almighty, we are free at last.”
“The riches of freedom and the security of justice.”
“Now is the time to make justice a reality for all of God's children.”
“There is nothing greater in all the world than freedom. It is worth paying for. It is worth losing a job for.”
“I have a dream that one day this nation will rise up and live out the true meaning of its creed.”
“We hold these truths to be self-evident, that all men are created equal.”
“No lie can live forever.”
“I have a dream that one day on the red hills of Georgia the sons of former slaves and the sons of former slave owners will be able to sit down together at the table of brotherhood.”
“We cannot walk alone. And as we walk, we must make the pledge that we shall always march ahead.”
“We refuse to believe that the bank of justice is bankrupt.”
“Now is the time to make real the promises of democracy.”
“1963 is not an end, but a beginning.”
“Nonviolence is a powerful and just weapon which cuts without wounding and ennobles the man who wields it.”
“The nonviolent resister does not seek to defeat or humiliate the opponent, but to win his friendship and understanding.”
“Nonviolence is the answer to the crucial political and moral questions of our time.”
“The aftermath of nonviolence is the creation of the beloved community.”
“History will have to record that the greatest tragedy of this period of social transition was not the strident clamor of the bad people, but the appalling silence of the good people.”
Common Questions About These Quotes
Where do most of MLK's quotes about justice come from?
The great majority come from a single source: the Letter from Birmingham Jail, written in April 1963 while King was jailed for demonstrating without a permit. That includes "Injustice anywhere is a threat to justice everywhere" and "Justice too long delayed is justice denied."
Did MLK actually say "the arc of the moral universe is long, but it bends toward justice"?
He used a version of this line in several speeches through the 1960s, but it did not originate with him — it traces back to Unitarian minister Theodore Parker, who wrote a longer version in an 1853 sermon. King condensed and popularized it.
What did MLK say separates a just law from an unjust one?
In the Letter from Birmingham Jail, he wrote: "An unjust law is a code that a numerical or power majority group compels a minority group to obey but does not make binding on itself." His test was whether the group making the rule was also bound by it.
What did MLK say about waiting for justice?
"Justice too long delayed is justice denied." From the Letter from Birmingham Jail, 1963.
Did MLK ever compare unjust laws to Nazi Germany?
Yes — "Never forget that everything Hitler did in Germany was legal," from the Letter from Birmingham Jail, arguing that legality alone doesn't make a law moral.