Do I Have to Accept All the Councils of the Church?

Florence: The Church has this long habit now of getting together and having these meetings called councils. Florence: Is it all infallible? Do we, you know, what's the role of those councils? Could I reject one, for example? She says there are levels of authoritative teaching even within the Council. "If you knowingly reject an ecumenical Council, you will be lost for all eternity," she adds.