The foucault–habermas debate is about how two important thinkers, Michel Foucault and Jurgen Habermas, had different ideas about truth. Foucault believed that truth is something that's always changing and that even if we think we know what the truth is, we don't really understand it. Habermas believed that truth is something that is absolute and that it is something that can be known and understood. Both thinkers had different ideas about power and authority and how they affect the truth.