II. Let them avail themselves betimes of God's long-suffering and return to Him
I entreat you, beloved, let those words of the Saviour touch your hearts, Who, when by the power of His mercy He had cleansed ten lepers, said that only one of them all had returned to give thanks: meaning without doubt that, though the ungrateful ones had gained soundness of body, yet their failure in this godly duty arose from ungodliness of heart. And therefore, dearly-beloved, that this brand of ingratitude may not be applied to you, return to the Lord, remembering the marvels which He has deigned to perform among us; and ascribing our release not, as the ungodly suppose, to the influences of the stars, but to the unspeakable mercy of Almighty God, Who has deigned to soften the hearts of raging barbarians, betake yourselves to the commemoration of so great a benefit with all the vigour of faith. Grave neglect must be atoned for by yet greater tokens of repentance. Let us use the Mercy of Him, Who has spared us, to our own amendment, that the blessed Peter and all the saints, who have always been near us in many afflictions, may deign to aid our entreaties for you to the merciful God, through Jesus Christ our Lord. Amen.
Source: Sermons (New Advent)