In Ecumenical Councils there are many lively debates and a profound search for the truth through reasoning, theological argument and council interventions; however once a subject has been debated, it is up to the Council Fathers – that is, the Bishops and especially the Pope who is the Chief of the Bishops – to decide, to reach a conclusion, to determine the mind of the Council. Once their determination has been made, everyone should acquiesce in it and accept it, not because of the arguments that were advanced in favor of the final determination, or the research that preceded it, but rather because of the authority of the Holy Spirit. Invisibly presiding at Ecumenical Councils, the Holy Spirit it is who really judges and determines by means of the mouths of His servants who have been established by Him as the Pastors of Christendom. All the reasoning, theological argument and council interventions are made, as it were, in front of the Church; while the actual decisions and determinations of the Council Fathers are made in the sanctuary, where the Holy Spirit does speak through the mouths of the visible heads of the local churches, just as Jesus Christ promised.
--St. Francis de Sales