Misrepresentation of Eck.
Eck's issue was this:
"Who has authority to interpret God's Word, the Church as a body or every man for himself?"
From which of Eck’s writings is your quotation taken?
With the Council of Toulouse, the church had banned possession of either the Old or New Testaments including any translations. So Eck was arguing out of the side of his mouth.
ITEM #2 COUNCIL OF TOULOUSE - 1229 A.D.
"Canon 14. We prohibit also that the laity should be permitted to have the books of the Old or New Testament... we most strictly forbid their having any translation of these books."
So you see the church had banned Phylacteries for the Jewish People and stacked the deck against the common man.
It was clearly a time for Reformation back to the Word of God.
Was Scripture written to the church as a body, or to the people in it?