If we define knowledge that way, leftyted's original claim (knowledge is language) becomes true by definition. This can lead to some confusion. In Frank Jackso

If we define knowledge that way, leftyted's original claim (knowledge is language) becomes true by definition. This can lead to some confusion. In Frank Jackson's Knowledge Argument[1], dualists say that qualia are knowledge, knowledge is language, and so if Mary could not learn qualia by studying science, then materialism is false. This argument trades on being inconsistent over what it means to have knowledge of something. [1] https://en.wikipedia.org/wiki/Knowledge_argument https://en.wikipedia.org/wiki/Knowledge_argument