When you affirm something you usually have the feeling that it is absolutely certain. The author Ludwig Wittgenstein wrote “On Certainty” which is a series of notes; the author wrote these notes towards the end of his life. The series deals with issues related to knowledge, doubt and skepticism. Although Wittgenstein's notes were not organized, some themes and concerns were present. He is usually called one of the most misunderstood philosophers in history. Thanks to his philosophical method, he was able to see life very differently. Attacking the methods used by other philosophers, such as the proposition, and blatantly exposed them as senseless or even nonsensical. According to him, a proposition has no meaning unless placed in a particular context. Through these notes one could discuss the context of human understanding and the problems surrounding all claims to certainty. To understand Wittgenstein “On Certainty” we must first begin to understand who Wittgenstein is addressing. The series of notes begins as a response to GE Moore, an author who wrote “A Proof of the external world.” Wittgenstein's notes were brought to light through Moore's essay discussing anti-skepticism and the anti-idealist. Moore's article attempts to demonstrate that there is an external world relevant to our senses. He then states that he has already demonstrated this existence by raising his hand “Here is a hand”. Moore then uses the example of his hand to boldly validate why anyone would question such a reasonable statement. Wittgenstein seems to admire Moore's claim to have a hand; however Wittgenstein uses the idea that any statement an individual thinks he knows can be doubted. Even more so, one could say that he is challenging M...... middle of the paper ...... instead of just expressing my subjective certainty, I must be able to convince myself that I am right. But I cannot do this, because my having two hands is no less certain before I look at them than after. But I could say: "That I have two hands is an irreversible belief." This would express the fact that I am not prepared to let anything count as a refutation of this statement” (Wittgenstein). One question that arises is a vital one and that is whether we become more secure in our certainty as we approach death or not. Judging by his notes, in recent days people are beginning to challenge and question human understanding. He soon promoted open discussion of even the most trivial issues. Consequently, Wittgenstein's purpose of his notes was to challenge other philosophers and bring new concepts to light. Through this you can begin to doubt and not claim to know but be certain.