On his part, man perceives and acknowledges the imperatives of the divine law through the mediation of conscience. In all his activity a man is bound to follow his conscience faithfully, in order that he may come to God, for whom he was created. It follows that he is not to be forced to act in a manner contrary to his conscience. Nor, on the other hand, is he to be restrained from acting in accordance with his conscience, especially in matters religious.
-Declaration on Religious Liberty (Dignitatis Humanae), # 3, December 7, 1965