Read Point 22 in the Syllabus of Errors! The following point is in error. “22. The obligation by which Catholic teachers and authors are strictly bound is confined to those things only which are proposed to universal belief as dogmas of faith by the infallible judgment of the Church.—Letter to the Archbishop of Munich, “Tuas libenter,” Dec. 21, 1863.” — You can’t only accept extraordinary teaching but must also accept ordinary teaching, which all ecumenical council fall under, even the pastoral ones of the medieval ages and Vatican II with religious submission. Even though religious submission is different than the assent of faith it is still gravely serious.