All Church Councils are aimed at achieving a more in-depth understanding of the faith, not at changing it. One result of the first two councils, which were held in 325 and 381 AD, was the Creed, the profession of the faith. You can find the Creed in many languages in the #DeoQuest app, together with the standard texts of the Mass.
Another important council was the one held at Trent during a number of separate meetings between 1545 and 1563. At Trent, answers were given to questions which had arisen during the Reformation. The most recent council is the Second Vatican Council, which took place between 1962 and 1965. Topics included the role of the lay faithful in the Church, and dialogue with other religions.
