Jesus, it is said, "taught them as one having authority, and not as the scribes" (Matt 7:29).
O that the Lord would raise up preachers who preach with the authority bestowed upon them by the Head of the church, and not like the professionals from whom they received their diploma.
To say this is not to condemn the faithful and hard work of study. It is to condemn the idea that the diploma has granted you authority - at least the kind of authority that Jesus had. For too long, the church has gotten this mixed up. And for quite some time, reacting instead of reforming, some have claimed that the faithful hard word of study was the problem. But that is not the problem. The problem is putting your faith in the hard work (and in the diploma) and not in the Spirit of God.