This means that even though enlightenment can't be explained in words since it transcends language and thought, in order to answer people's wish to be taught an explanation is made for this unexplainable enlightenment.
これは、さとりは、言語や思惟をこえて不可説のものであるが、衆生の機縁に応じるため、この説けないさとりを説き起すことをさす。