taught. was continually teaching.
having authority: i.e. possessing Divine authority. Greek. exousia. App-172. In the current Hebrew literature of that time it denoted the Hebrew mippi hagg burah. from the mouth of God. See notes on Matthew 26:64.Mark 14:62, and Hebrews 1:3.
and not. Note the Figure of speech Pleonasm (App-6). Jewish teachers always referred to tradition, or to what some other teacher had said; and do so to this day.