But the peoples themselves are called upon to make up their minds to a definite choice: either they entrust themselves to these benevolent and beneficent inspirations and are converted, humble and repentant, to the Lord and the Father of mercies, or they hand over themselves and what little remains of happiness on earth to the mercy of the enemy of God, to the spirit of vengeance and destruction. (Papal Encyclical, Caritate Christi Compulsi, 3 May 1932).
Faith is said first to be an obedient response to God. This implies that God be acknowledged in his divinity, transcendence and supreme freedom. By the authority of his absolute transcendence, God who makes himself known is also the source of the credibility of what he reveals. By faith, men and women give their assent to this divine testimony. This means that they acknowledge fully and integrally the truth of what is revealed because it is God himself who is the guarantor of that truth. They can make no claim upon this truth which comes to them as gift and which, set within the context of interpersonal communication, urges reason to be open to it and to embrace its profound meaning. This is why the Church has always considered the act of entrusting oneself to God to be a moment of fundamental decision which engages the whole person. In that act, the intellect and the will display their spiritual nature, enabling the subject to act in a way which realizes personal freedom to the full. It is not just that freedom is part of the act of faith: it is absolutely required. Indeed, it is faith that allows individuals to give consummate expression to their own freedom. Put differently, freedom is not realized in decisions made against God. For how could it be an exercise of true freedom to refuse to be open to the very reality which enables our self-realization? Men and women can accomplish no more important act in their lives than the act of faith; it is here that freedom reaches the certainty of truth and chooses to live in that truth. (Papal Encyclical, Fides et Ratio, 14 September 1998).