Neither my friend nor I are pastors. I explained I read on Logos: commentaries, systematic theologies, monographs, and etc.
He came back, essentially, with the belief that a person should read the pure word of God, so to have nothing between one and God. I then said pastors create sermons using such that I read.
In very general terms, as a pastor, how many books do you consult for each sermon? How long does it take to write the weekly sermon, on average??