On Certainty

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Written over the last 18 months of his life and inspired by his interest in G. E. Moore's defence of common sense, this much discussed volume collects Wittgenstein's reflections on knowledge and certainty, on what it is to know a proposition for sure.

208 pages, Paperback

First published January 1,1969

About the author

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Ludwig Josef Johann Wittgenstein (Ph.D., Trinity College, Cambridge University, 1929) was an Austrian-British philosopher who worked primarily in logic, the philosophy of mathematics, the philosophy of mind, and the philosophy of language.

Described by Bertrand Russell as "the most perfect example I have ever known of genius as traditionally conceived, passionate, profound, intense, and dominating", he helped inspire two of the twentieth century's principal philosophical movements: the Vienna Circle and Oxford ordinary language philosophy. According to an end of the century poll, professional philosophers in Canada and the U.S. rank both his Tractatus Logico-Philosophicus and Philosophical Investigations among the top five most important books in twentieth-century philosophy, the latter standing out as "...the one crossover masterpiece in twentieth-century philosophy, appealing across diverse specializations and philosophical orientations". Wittgenstein's influence has been felt in nearly every field of the humanities and social sciences, yet there are widely diverging interpretations of his thought.


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July 15,2025
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I don't have a great fondness for the format of this book. It simply consists of 600 - 700 numbered aphorisms, or in some cases, just statements by Wittgenstein. There is no real structure, although certain statements do follow from those that preceded them.

That being said, the numbered statements are truly interesting and sometimes quite strange yet quite logical. Also, as a beginner German student, it's wonderful to have short statements like this in a bilingual edition. Many words are used repeatedly, and it provides excellent practice for reading aloud and thus memorizing new vocabulary.

I'm aware that this review doesn't say much that is useful about Wittgenstein's work itself. I've never read him before, so I can't speak with any authority about much of anything related to the content. I do feel that he could have delved deeper into the linguistic aspect of his assertions. His discussions of certainty and doubt rely on the concept of "Sprachspiele" or "language game." So it's a bit frustrating that Wittgenstein fails to discuss the significance of the game for statements like "Water boils at 100 degrees Celsius." He questions whether such a statement can be made with any certainty, yet doesn't acknowledge the difference between this statement and "I know that this is my hand." It seems to me that the next step is obvious: to talk about the fact that what we call "boiling" occurs at 100 degrees because we (humans, speakers) decided to call boiling boiling and because we decided to call the temperature at which "boiling" takes place by the measurement "100 degrees." The question of how I know that my hand is my hand or the question of whether a table still exists when no one is looking at it is of an entirely different nature.

Perhaps I'm being foolish in judging this work as I have. It is a collection of thoughts that dates up to two days before Wittgenstein's death. Maybe he had planned to address the linguistic issues but never got around to it.
July 15,2025
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Vic highly recommends an author as his favorite (linguistic) philosopher. The philosopher holds the concept that language can only be understood when it is externalized and everyone reaches a common understanding.

For example, there is the Beetle Box concept. It goes like this: "What I have in this box is a beetle. Tell everyone it is so." And then, and only then, when the masses comprehend the concept expressed in the language, can a meaningful discourse about it take place.

Moreover, this philosopher writes in aphorisms, which are short and pithy statements that convey profound wisdom or insights. These aphorisms often require careful thought and reflection to fully understand their meaning and significance. Vic finds this way of writing both challenging and intellectually stimulating, as it forces him to engage deeply with the philosopher's ideas and思考 them from different perspectives.
July 15,2025
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Puro pinche Wittgenstein. He is truly the GOAT. A mastodon, a fierce beast, a machine. Here's an unpopular opinion. This is the third Wittgenstein, the one that all of us were looking for. Enough of the nonsense. All of life is a game, and games are just that. Games of language, forms of life, images of the world. Thanks for messing up my existence. A kiss.


Wittgenstein's ideas have had a profound impact on philosophy and our understanding of language and reality. His exploration of the nature of language games and forms of life has opened up new ways of thinking about how we make sense of the world around us. While his work may be complex and challenging, it is also deeply rewarding for those who are willing to engage with it.


Despite his importance, Wittgenstein remains a somewhat controversial figure. Some people love his ideas, while others find them晦涩难懂 or even objectionable. But regardless of one's personal opinion, there is no denying the influence that he has had on philosophy and beyond. So here's to Wittgenstein, the GOAT of philosophy.

July 15,2025
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Epistemology as linguistic analysis is an interesting perspective. The phrase "I know _" can be more aptly rephrased as "I believe _ to be so", which indicates a certain degree of certainty about a proposition within a specific frame of reference. The understanding that all judgments of "truth" ultimately rely on some faithful assumption is indeed an important insight.

However, rather than delving deeper into Wittgenstein's rabbit hole of stifling hypotheticals, I would much prefer to read about the domain-specificity of skepticism and heuristics as Nassim Taleb presents. In Wittgenstein's works, we may hear the faint murmurs of understanding, but there is a lack of dynamic movement. Ayn Rand's criticism of the philosophy of language as sterile and ultimately impotent holds some truth. After all, the question of how many Wittgensteins can dance on the head of a pin is somewhat thought-provoking, but it's not really to my taste.

"I believe it might interest a philosopher, one who can think for himself, to read my notes. For even if I have hit the mark only rarely, he would recognize what targets I had been ceaselessly aiming at." This statement further emphasizes the idea that different philosophers have their own unique perspectives and pursuits in the realm of knowledge and language.
July 15,2025
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Devi crederci Witt.

In questo mondo, ci sarà una storia d'amore meravigliosa in un mondo migliore. Un mondo dove l'amore è vero e profondo, dove le persone si amano senza condizioni.

Ci sarà un azzurro più intenso in un cielo più immenso. Il cielo sarà così blu e limpido, come se fosse un lago infinito.

E ci sarà la tua ombra al mio fianco vestita di bianco. Tu sarai sempre accanto a me, come una presenza calma e confortante.

Questa è la certezza che abbiamo, la certezza dell'amore e della bellezza.

Potete scoprire questa storia d'amore e molto altro ancora guardando il video sul seguente link: http://youtu.be/ctvldN26Rfs.

Non perdete l'occasione di entrare in questo mondo meraviglioso.
July 15,2025
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I read this when all my reads were goodwill finds.

I resided in a small college town and devoured numerous excellent philosophy books.

I had a penchant for this book as it dawned on me that everything we believe we know might have been imparted to us by someone else.

We have never truly experienced them or verified the facts; we simply accept "their" society's truth.

One can only start to perceive beyond one's acculturation once one realizes that one has been brainwashed.

It made me question the validity of the knowledge and beliefs that I had taken for granted.

I began to wonder how many of the things I thought were true were actually just the result of the influence of the society I grew up in.

This book served as a catalyst for my intellectual growth and made me more critical of the information I received.

It taught me to always question and seek the truth for myself.

Overall, it was a thought-provoking and eye-opening read that had a profound impact on my perspective.
July 15,2025
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It seems to me that Wittgenstein, in this very late work, endeavors to address the questions posed in his Tractatus using the terminology he adopted in his mid-period, namely that of the language games from the Blue and Brown Books and Philosophical Investigations. With On Certainty, completed just two days before his death, I believe Wittgenstein reaches surprisingly Kantian conclusions.

Wittgenstein commences both this work and the Tractatus with an exploration into that which he can be certain of. In the Tractatus, he asks himself what he truly knows. In On Certainty, he ponders what he can and cannot be said to doubt. Doubting everything, Wittgenstein proclaims in the latter part of the text, would not truly be doubt at all. Doubting everything would render one unable to act or think as one would no longer believe even in the meaning of the words used to express doubt. The language game of social existence could not persist under such circumstances, and doubt is actually a product of the language game, one might say a subgenre of the game. (Does not Descartes, in doubting even his own existence, ultimately validate that existence and even assert its primacy?)

So, one cannot doubt the rules of the game themselves (i.e., “everything”), but one most definitely can doubt within the rules of the game. To determine if a proposition can be doubted, Wittgenstein says, look at what supports the proposition's truth-claim. In almost all cases, he contends, it will only be other propositions. Language games rely on themselves as proof. Even mathematics, Wittgenstein holds, is a kind of language game, asserting the certainty of its conclusions by insisting on the validity of its own rules. Within a language game, what is true is what is comprehensible according to the rules. Therefore, something can be doubted if said doubt does not make other propositions impossible (meaning that the vast majority of propositions can be doubted), but the doubt employed will (in the vast majority of cases) only end by affirming the rules of the game. (Wittgenstein does here acknowledge, which I don't think the young author of the Tractatus would have, that there are very rare instances when a doubt changes the rules of the game, for example, a momentous scientific “discovery” – something interestingly akin to a Badiouian Event. At any rate, for Wittgenstein, unlike Badiou, the game of meaning simply keeps reinventing itself and imposing its rules on us, even in cases of major changes to the way the game is played. I do think this avowal by Wittgenstein of the possibility of changes to the rules, while valid, gets him into some philosophical trouble. How can the rules not be doubted if doubt can change the rules?)

Wittgenstein distinguishes between “knowledge”, that which one must subscribe to if one is to continue believing anything, i.e., to continue playing the language game, and “certainty”, a term that he thinks, if we were to live completely honestly, we would abolish. “I am certain” should, ideally, be replaced with “I believe I know”. Belief is the ultimate justification for knowledge, and there is no ultimate justification for belief, except perhaps for faith, which is spiritual, not scientific, mathematical, or philosophical.

Wittgenstein's distinction between “knowledge” and “certainty” strikes me as similar to that of Kant between the phenomenal and noumenal worlds. As with Kant, in On Certainty, we must think about the world in a way that enables us to keep thinking and acting in the world, whether or not said thinking corresponds to the reality of the world-in-itself. There are, of course, major differences between the two ontologies. For Kant, it is the nature of the human mind and senses that determines the shape of our experience, of our phenomenal world. For Wittgenstein, it is the rules of the particular language game that a person is taught to play that determine how a person thinks and acts. He describes a war of cultures as a contest between different language games, each trying, futilely, to persuade the other of its correctness. (Kant's nature versus Wittgenstein's nurture)

Whenever I read Wittgenstein, I sense a repressed fear and, yes, uncertainty. But the nervous energy is palpable in this last work, written as the philosopher was literally on his deathbed. Faced with the immediacy of the absolute uncertainty of death, I think the man clung to philosophy as both a comfort and an outlet for his dreadful suspicion that life may, in fact, be but a dream.
July 15,2025
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Abdul Qari, presents you with the new without talking about any new.

But I think it needs a second reading after a while. It is a mixture of the subject of knowledge, language, and logic. It actually explores "in certainty."

Whether you agreed or disagreed with his views, it is impossible to deny his distinctiveness.

This work seems to have a certain depth and complexity that requires careful consideration and reflection. It may challenge your existing ideas and make you think about things from different perspectives.

The author's exploration of "certainty" is particularly interesting. In a world full of uncertainties, trying to find a certain degree of certainty is not an easy task.

Overall, this is a work that is worth reading and pondering. It may bring you some new inspirations and insights.
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