 The most well-know epistemic paradox is the paradox of the knower. This paradox has many equivalent formulations, one of them based on the sentence “This sentence is not known by anyone.” Let us call this sentence the knower sentence, abbreviated \(KS. KS\) is obviously quite similar to the liar sentence, except the central concept involved is knowledge rather than truth. The reasoning leading to a contradiction from \(KS\) is a bit more complex than in the liar paradox. First \(KS\) is shown to be true by the following piece of reasoning: