12 In faithfulness therefore to the truth of the Gospel, the Church is following the way of Christ and the apostles when she recognizes and gives support to the principle of religious freedom as befitting the dignity of man and as being in accord with divine revelation. Throughout the ages the Church has kept safe and handed on the doctrine received from the Master and from the apostles. In the life of the People of God, as it has made its pilgrim way through the vicissitudes of human history, there has at times appeared a way of acting that was hardly in accord with the spirit of the Gospel or even opposed to it. Nevertheless, the doctrine of the Church that no one is to be coerced into faith has always stood firm. Thus the leaven of the Gospel has long been about its quiet work in the minds of men, and to it is due in great measure the fact that in the course of time men have come more widely to recognize their dignity as persons, and the conviction has grown stronger that the person in society is to be kept free from all manner of coercion in matters religious.
Source: Dignitatis Humanae (Vatican.va)