The first experience of Joseph Raz, a professor of law at Columbia University, is the embarrassment of his writings. This is not the only "problem" of Raz. Kant has responded to those who accuse him of "deliberately confusing". He said: "It is unimaginable to write the theme to be popular. On the contrary, we must use academic precise language… Only using this language can be too sloppy. Expressed, people can understand their original intentions and not be considered to be dogmatic and arbitrary."