23 The Lord also in His Gospel, setting forth the love of God the Father, says, “What man is there of you, whom, if his son ask bread, will he give him a stone? Or if he ask a fish, will he give him a serpent? If you then, being evil, know how to give good gifts unto your children, how much l more shall your heavenly Father give good things to them that ask Him?” The Lord is here comparing the father after the flesh, and the eternal and liberal love of God the Father.
But if that evil father upon earth, deeply offended by a sinful and evil son, yet if he should see the same son afterwards reformed, and, the sins of his former life being put away, restored to sobriety and morality and to the discipline of innocence by the sorrow of his repentance, both rejoices and gives thanks, and with the eagerness of a father's exultation, embraces the restored one, whom before he had cast out; how much more does that one and true Father, good, merciful, and loving— yea, Himself Goodness and Mercy and Love— rejoice in the repentance of His own sons! nor threatens punishment to those who are now repenting, or mourning and lamenting, but rather promises pardon and clemency.
Whence the Lord in the Gospel calls those that mourn, blessed; because he who mourns calls forth mercy. He who is stubborn and haughty heaps up wrath against himself, and the punishment of the coming judgment. And therefore, dearest brother, we have decided that those who do not repent, nor give evidence of sorrow for their sins with their whole heart, and with manifest profession of their lamentation, are to be absolutely restrained from the hope of communion and peace if they begin to beg for them in the midst of sickness and peril; because it is not repentance for sin, but the warning of urgent death, that drives them to ask; and he is not worthy to receive consolation in death who has not reflected that he was about to die.
Source: The Epistles of Cyprian (New Advent)