I came across this quote of Shankaracharya:
Shankarāchārya says, "Shruti is a means of direct perception [in the sphere of transcendent knowledge], since, in order to be an authority it is necessarily independent of all other authorities; while Smriti plays a part that is analogous to induction, in that it derives its authority from an authority other than itself."
What's the source of this quote?
Edit: I want the source from Shankara's works. Because the author has claimed that Shankara has said this. I want to verify this.
I'm also interested in scholarly content* that compares the authority of Shruti and Smriti. Does Smriti have less authority or the same authority in comparison with shruti?