The most important council was the Council of Trent (Trento) because it was convened by Pope Paul III on 22 May 1542, and continued by the two popes who succeeded him, Julius III and Pius IV (1545-1563). ), so after that we received the Roman Missal issued by Pope Pius V, which is still in use today. He issued the Bull Quo primum tempore on 14 July 1570 for all churches in the Latin style. There are many clear ideas and teachings published by the Council of Trent, namely: Defence of the Holy Scriptures (called Volgata).

Doctrines on original sin, self-sanctification and grace, the sacraments, especially the Eucharist and the Mass or Holy Sacrifice, respect for the Blessed Sacrament, respect for icons, indulgences. Condemnation of the false ideas of Luther and his friends.

Vatican Council I (Rome) tried to fix many things, but due to the outbreak of war, it was cut short and did not last, but it was soon completed (1869-1870), so these are the decisions and communicated, resulting in the granting of full authority to the Pope to make "Ex-Cathedra" teaching: Definition on God the Creator, and on God's Revelation, Faith and its relation to the spirit of discernment, the Church, the Supreme President and the "infallibility" of the Bishop of Rome (Pope). This dogma was clearly stated on 18 July 1870 and was fulfilled and confirmed by the Second Vatican Council on 21 November 1964.