6 If you have anything against any man, forgive it: you come here to receive forgiveness of sins, and thou also must forgive him that has sinned against you. Else with what face will you say to the Lord, Forgive me my many sins, if you have not yourself forgiven your fellow-servant even his little sins. Attend diligently the Church assemblies; not only now when diligent attendance is required of you by the Clergy, but also after you have received the grace. For if, before you have received it, the practice is good, is it not also good after the bestowal?
If before thou be grafted in, it is a safe course to be watered and tended, is it not far better after the planting? Wrestle for your own soul, especially in such days as these. Nourish your soul with sacred readings; for the Lord has prepared for you a spiritual table; therefore say thou also after the Psalmist, The Lord is my shepherd, and I shall lack nothing: in a place of grass, there has He made me rest; He has fed me beside the waters of comfort, He has converted my soul:— that Angels also may share your joy, and Christ Himself the great High Priest, having accepted your resolve, may present you all to the Father, saying, Behold, I and the children whom God has given Me. May He keep you all well-pleasing in His sight!
To whom be the glory, and the power unto the endless ages of eternity. Amen.
Source: Catechetical Lectures (New Advent)