9 The declaration of this Vatican Council on the right of man to religious freedom has its foundation in the dignity of the person, whose exigencies have come to be are fully known to human reason through centuries of experience. What is more, this doctrine of freedom has roots in divine revelation, and for this reason Christians are bound to respect it all the more conscientiously. Revelation does not indeed affirm in so many words the right of man to immunity from external coercion in matters religious. It does, however, disclose the dignity of the human person in its full dimensions. It gives evidence of the respect which Christ showed toward the freedom with which man is to fulfill his duty of belief in the word of God and it gives us lessons in the spirit which disciples of such a Master ought to adopt and continually follow. Thus further light is cast upon the general principles upon which the doctrine of this declaration on religious freedom is based. In particular, religious freedom in society is entirely consonant with the freedom of the act of Christian faith.
Source: Dignitatis Humanae (Vatican.va)