Mercy in itself, as a perfection of the infinite God, is also infinite. Also infinite therefore and inexhaustible is the Father’s readiness to receive the prodigal children who return to His home. Infinite are the readiness and power of forgiveness which flow continually from the marvelous value of the sacrifice of the Son. No human sin can prevail over this power or even limit it. On the part of man only a lack of good will can limit it, a lack of readiness to be converted and to repent, in other words persistence in obstinacy, opposing grace and truth, especially in the face of the witness of the cross and resurrection of Christ.
Therefore, the Church professes and proclaims conversion. Conversion to God always consists in discovering His mercy, that is, in discovering that love which is patient and kind as only the Creator and Father can be; the love to which the “God and Father of our Lord Jesus Christ” is faithful to the uttermost consequences in the history of His covenant with man; even to the cross and to the death and resurrection of the Son. Conversion to God is always the fruit of the “rediscovery” of this Father, who is rich in mercy.
Authentic knowledge of the God of mercy, the God of tender love, is a constant and inexhaustible source of conversion, not only as a momentary interior act but also as a permanent attitude, as a state of mind. Those who come to know God in this way, who “see” Him in this way, can live only in a state of being continually converted to Him. They live, therefore, in statu conversionis; and it is this state of conversion which marks out the most profound element of the pilgrimage of every man and woman on earth in statu viatoris. It is obvious that the Church professes the mercy of God, revealed in the crucified and risen Christ, not only by the word of her teaching but above all through the deepest pulsation of the life of the whole People of God. By means of this testimony of life, the Church fulfills the mission proper to the People of God, the mission which is a sharing in and, in a sense, a continuation of the messianic mission of Christ Himself.
The contemporary Church is profoundly conscious that only on the basis of the mercy of God will she be able to carry out the tasks that derive from the teaching of the Second Vatican Council, and, in the first place, the ecumenical task which aims at uniting all those who confess Christ. As she makes many efforts in this direction, the Church confesses with humility that only that love which is more powerful than the weakness of human divisions can definitively bring about that unity which Christ implored from the Father and which the Spirit never ceases to beseech for us “with sighs too deep for words.”
Encyclical on the Mercy of God
John Paul II
(my emphasis added in bold)