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It shows up on graduation cards. It gets said at funerals, and in therapy, and in the kind of late conversation where someone is trying to explain a decision they made ten years ago. “Life can only be understood backwards; but it must be lived forwards.” Søren Kierkegaard, 1843.
People reach for it at a very particular moment: when a choice has to be made and there is not enough information to make it. Which is every real choice. The line seems to hand you permission to go ahead anyway, because the meaning will arrive later.
He did write it. The wording we pass around is a tidy compression of what he wrote, and the entry it comes from has a third sentence that almost nobody quotes. That third sentence takes the comfort back.
What the quote is actually claiming
Read the popular version slowly and it works like a proverb with two balanced halves. Understanding comes later. Living comes now. Two facts, held side by side, and the balance between them is the consolation. You are not meant to understand yet. Carry on.
That reading turns the sentence into advice. And here is the problem: Kierkegaard was not giving advice. He was writing in a private notebook, and he was recording a problem he could not solve.
The quoted version resolves. The entry does not. It opens with something he is willing to grant, adds the thing everyone forgets, and then follows both of them to a place with no exit. The poster stops at the balance. He kept writing.
It was a journal entry, and it has a third sentence
This is not from one of his books. It comes from an 1843 entry in his journals, catalogued as JJ:167 in the Danish critical edition Søren Kierkegaards Skrifter (volume 18, page 194), and as IV A 164 in the older numbering of his papers. You will see both references, and they point to the same entry.
He never published it. His notebooks reached print after his death, which means the most quoted sentence of his life is one he wrote to nobody.
Here is the Danish, as the Søren Kierkegaard Research Centre at the University of Copenhagen prints it:
Det er ganske sandt, hvad Philosophien siger, at Livet maa forstaaes baglænds. Men derover glemmer man den anden Sætning, at det maa leves forlænds. Hvilken Sætning, jo meer den gjennemtænkes, netop ender med, at Livet i Timeligheden aldrig ret bliver forstaaeligt, netop fordi jeg intet Øieblik kan faae fuldelig Ro til at indtage Stillingen: baglænds.
In plain English, kept close to the Danish: it is quite true, what philosophy says, that life must be understood backwards. But in saying so, people forget the other sentence, that it must be lived forwards. Which sentence, the more it is thought through, ends up exactly here: that life in time never really becomes understandable, precisely because I can get no moment of full rest in which to take up the position — backwards.
Sit with that last clause. The reason understanding never arrives is not that you have not waited long enough. It is that there is no still place to stand and look back from. You would have to stop living for a moment in order to understand, and you cannot stop living for a moment. So the backward look never gets its turn.
The quoted version says: understanding comes afterwards. The entry says: there is no afterwards.
What 1843 looked like for him
He was twenty-eight when he broke the engagement. He had proposed to Regine Olsen in 1840, ended it for good in 1841, and left for Berlin. He spent the rest of his life unmarried, and much of his writing circles back to that decision.
Then 1843 happened. Either/Or came out on 20 February. On 16 October he published three books on the same day: Fear and Trembling, Repetition, and Three Upbuilding Discourses. Two of the three went out under invented names rather than his own.
So the man writing “I can get no moment of full rest” was in the most crowded year of his working life, publishing at a rate that is hard to believe, while turning over a decision about a person he had already lost. The sentence is not a seminar observation. It is a report from inside.
He was quoting someone — and nobody can find them
Look again at how the entry opens. “It is quite true, what philosophy says.” He is not announcing the first half as his own idea. He is granting it to somebody else.
So who said it? The editorial commentary in Søren Kierkegaards Skrifter, written by Peter Tudvad, says the line most likely points back to Karl Daub, a German theologian who taught at Heidelberg from 1795 until his death in 1836. Kierkegaard had already credited Daub, five years earlier, with the idea that a moment must come in which life is understood backwards through the idea. That was in From the Papers of One Still Living — his own first book, published in 1838, and in form a review of a Hans Christian Andersen novel.
And then the commentary adds one more line: the source could not be identified. Nobody has located where Daub actually said it.
Which leaves something strange and rather wonderful. The most famous sentence about understanding life in hindsight begins with Kierkegaard attributing half of it to another man, and the trail to that man goes cold. Even the quote’s own provenance can only be understood backwards, and even backwards it runs out.
How the short version took over
In Danish, the condensed form is best known as the title of a book: Peter Thielst’s 1994 biography of Kierkegaard, published by Gyldendal, is called Livet forstås baglæns, men må leves forlæns. A title has to be short. A journal entry does not.
In English the line travels in several shapes. “Life can only be understood backwards; but it must be lived forwards” is the common one. You will also meet “life must be understood backward, but it must be lived forward,” and the clipped “we live forward, but we understand backward.” All of them keep the balance. None of them keep the third sentence.
That is the whole drift, in one move. A man wrote down why the balance cannot be struck, and we kept the balance and dropped the reason.
The oldest version of this problem
Here is what surprised us most while reading the entry. The problem Kierkegaard hit in 1843 was written down a very long time before 1843, and in almost the same two halves.
Ecclesiastes is the book in the Bible where a man takes his own life apart to see how it worked, and reports honestly that he could not finish the job. In the middle of it sits this:
He hath made every thing beautiful in his time: also he hath set the world in their heart, so that no man can find out the work that God maketh from the beginning to the end.
Ecclesiastes 3:11, KJV
Two halves again. Something in us is built to want the whole picture — that is the part set in the heart. And we cannot get it, from beginning to end, which is the part that will not come.
There is no sign that Kierkegaard had this verse in front of him when he wrote the entry, and we are not claiming he did. The interesting thing is not influence. It is that a Danish writer in a notebook and an ancient teacher in Jerusalem arrived at the same shaped problem, and neither of them pretended to have solved it.
What Ecclesiastes does next is worth noticing, because it is not what you would expect from a book that has just said understanding is out of reach. It does not advise you to try harder at looking back. It turns toward the ordinary day — bread, work, the people you live with — and treats that day as the gift it is. The understanding stays with God. The day is yours.
Three thousand years later a man in Copenhagen reached the same wall and wrote it in a notebook. People keep arriving here. People keep forgetting. That is probably why the sentence will not leave us alone.
Back to the line
“Life can only be understood backwards; but it must be lived forwards” is usually offered as reassurance. It will make sense later.
The full entry offers something else, and in a hard week it is better company. It says the reason your life does not add up tonight is not that you are bad at reflecting. It is that nobody gets the still moment the adding-up would need. Kierkegaard did not get it either, in the busiest year he ever had, and he wrote that down privately instead of selling it as wisdom.
If you are standing in the middle of something you cannot make sense of, you are not failing at a skill. You are in the ordinary human position, and you are in good company there. The understanding may come. The day in front of you is here now.
Kierkegaard is almost never quoted as the Christian writer he was, which is its own small irony. If this kind of digging interests you, we did the same thing to another line from a thinker nobody files under faith: what Pascal actually wrote about sitting quietly in a room alone turns out to hinge on the same word Kierkegaard needed and could not find — rest. And if the backward look is the thing keeping you up, the feeling that you have wasted your life is not actually measuring lost time. For one more quote taken back to its source, see what Sartre said he really meant by “hell is other people”.
Questions people ask about “life can only be understood backwards”
Did Kierkegaard really say “life can only be understood backwards”?
Yes — the idea is genuinely Kierkegaard’s, though the familiar wording is a compression. He wrote it in an 1843 journal entry, catalogued as JJ:167 in the Danish critical edition Søren Kierkegaards Skrifter and as IV A 164 in the older numbering. The Danish says that life must be understood backwards and that people forget the other sentence, that it must be lived forwards. He also wrote a third sentence, which the popular version drops. And he presents the first half not as his own thought but as something “philosophy says.”
What did Kierkegaard mean by “life can only be understood backwards”?
Kierkegaard meant something harder than the quote suggests. “Life can only be understood backwards; but it must be lived forwards” is usually read as a balance: understanding arrives later, so live bravely now. But in the same entry he follows both halves to their conclusion and says that life in time never really becomes understandable at all — because he can get no moment of full rest in which to take up the backward-looking position. You would have to stop living in order to understand, and you cannot. So it is not a promise that hindsight will deliver. It is an admission that hindsight never fully gets its turn.
What is the full quote about life being understood backwards and lived forwards?
The full 1843 entry runs to three sentences, not two. Kept close to the Danish: it is quite true, what philosophy says, that life must be understood backwards; but in saying so people forget the other sentence, that it must be lived forwards; which sentence, the more it is thought through, ends up exactly here — that life in time never really becomes understandable, precisely because I can get no moment of full rest in which to take up the position, backwards. The third sentence is the one that almost never travels with the quote.
Where does the quote “life can only be understood backwards” come from?
“Life can only be understood backwards” comes from Kierkegaard’s private journals, not from any book he published. The entry is dated 1843 and appears in Søren Kierkegaards Skrifter volume 18, page 194, as journal entry JJ:167. His notebooks were printed after his death in 1855. In Danish the shortened form is widely known as the title of Peter Thielst’s 1994 Kierkegaard biography for Gyldendal, Livet forstås baglæns, men må leves forlæns.
Is “we live forward, but we understand backward” the same quote?
Yes, “we live forward, but we understand backward” is the same Kierkegaard line in a shorter English dress, and you will also see it as “life must be understood backward, but it must be lived forward.” The journal entry was written in Danish, so every English form you meet is a translation choice rather than his exact words. All the short versions keep the two balanced halves. None of them keep his third sentence, which is where he says the balance cannot actually be struck.
A question for you
Which quote have you carried for years, only to find out later that the second half changes it? We would genuinely like to know — those are the ones we go looking for next.
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I’ve quoted “life can only be understood backwards, but it must be lived forwards” for years. Just found out Kierkegaard wrote a third sentence: life in time never really becomes understandable, because you never get a still moment to look back from. He wasn’t reassuring us. He was stuck too.
That Kierkegaard line about understanding life backwards? It’s from a private notebook, 1843 — and he opens by crediting the idea to “philosophy,” meaning a German theologian whose source nobody has ever managed to find. The quote’s own history can’t be traced backwards either.
I had no idea the most famous sentence Kierkegaard ever wrote was one he never published. It was in a journal, in the same year he put out a stack of books, right after he broke off his engagement. Different sentence once you know that.
